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          Genuine BMW 54377128781 - Convertible Top Hydraulic Cylinder (Front Left)

          MPN: 54377128781
          The Genuine BMW 54377128781 Convertible Top Hydraulic Cylinder ensures smooth operation of your convertible top. Designed for durability and OEM precision, it's essential for maintaining functionality.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $432.35
          In stock

          Product Overview

          The Genuine BMW Convertible Top Hydraulic Cylinder is a crucial component designed specifically for BMW convertible models. Engineered to OEM standards, this hydraulic cylinder ensures seamless operation of your convertible top, providing an effortless driving experience. Crafted with premium-grade materials, this hydraulic cylinder is built to withstand the rigorous demands of regular use, guaranteeing exceptional performance and long-lasting durability. With its precise design, this part fits seamlessly into your BMW, ensuring your convertible top functions flawlessly, enhancing your vehicle's convenience and luxury. Choose Genuine BMW 54377128781 for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Genuine BMW 54377128781 is equivalent to or replaces the following part numbers: 54 37 7 128 781.

          Vehicle Compatibility

          • BMW M4 (2016–2017)
          • BMW 440i (2016–2017)
          • BMW 440i xDrive (2016–2017)
          • BMW 430i (2016–2017)
          • BMW 430i xDrive (2016–2017)
          • BMW 428i (2014–2016)
          • BMW 428i xDrive (2014–2016)
          • BMW 435i (2014–2016)
          • BMW 435i xDrive (2014–2016)
          • BMW 328i (2007–2013)

          This may also fit other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fit™ - complete repair solutions with no guesswork
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the Genuine BMW 54377128781 Convertible Top Hydraulic Cylinder do?

          The Convertible Top Hydraulic Cylinder plays a vital role in the operation of your BMW's convertible top, enabling it to open and close smoothly. Its reliable performance is essential for maintaining the functionality of your convertible roof system.

          How do I know if my Convertible Top Hydraulic Cylinder needs replacement?

          Symptoms of a failing hydraulic cylinder include difficulty in operating the convertible top, leaks around the hydraulic cylinder, and unusual noises during operation. If you experience any of these issues, it may be time for a replacement.

          Can I install the Genuine BMW 54377128781 myself?

          Yes, you can install the hydraulic cylinder yourself if you have basic mechanical skills and tools. However, ensure to follow the manufacturer's guidelines and take proper safety precautions during installation.

          What are the symptoms of a faulty Convertible Top Hydraulic Cylinder?

          Common symptoms include issues with raising or lowering the convertible top, visible hydraulic fluid leaks, and strange sounds during the operation. If you notice any of these signs, it is advisable to inspect the hydraulic cylinder for potential failure.

          Why should I choose Genuine BMW for my Convertible Top Hydraulic Cylinder needs?

          Genuine BMW parts, like the 54377128781, are designed for optimal performance and fitment. Trust in the quality and reliability of Genuine BMW components to maintain the integrity of your vehicle. Order Genuine BMW 54377128781 today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              946781
            • Weight
              1.12 lbs
            • Manufacturer Part #
              54377128781
          • Brand
            Genuine BMW
          • Manufacturer
            Genuine BMW
          • MPN
            54377128781
          • Part Type
            Convertible Top Hydraulic Cylinder
          • Position
            Front Left
          • OE Part Numbers
            54 37 7 128 781, 54377128781
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2007BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2007BMW328xiBase (3.0 L6 GAS)Notes: front roof panel
          2007BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2008BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2008BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2008BMW328xiBase (3.0 L6 GAS)Notes: front roof panel
          2008BMW335xiBase (3.0 L6 GAS)Notes: front roof panel
          2008BMWM3Base (4.0 V8 GAS)Notes: front roof panel
          2009BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2009BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2009BMWM3Base (4.0 V8 GAS)Notes: front roof panel
          2009BMW328i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2009BMW335i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2010BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2010BMW328i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2010BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2010BMW335i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2010BMWM3Base (4.0 V8 GAS)Notes: front roof panel
          2011BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2011BMW328i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2011BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2011BMW335i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2011BMW335isBase (3.0 L6 GAS)Notes: front roof panel
          2011BMWM3Base (4.0 V8 GAS)Notes: front roof panel
          2012BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2012BMW328iBase (2.0 L4 GAS)Notes: front roof panel
          2012BMW328i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2012BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2012BMW335isBase (3.0 L6 GAS)Notes: front roof panel
          2012BMW335i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2012BMWM3Base (4.0 V8 GAS)Notes: front roof panel
          2013BMW328iBase (3.0 L6 GAS)Notes: front roof panel
          2013BMW328iBase (2.0 L4 GAS)Notes: front roof panel
          2013BMW335iBase (3.0 L6 GAS)Notes: front roof panel
          2013BMW328i xDriveBase (2.0 L4 GAS)Notes: front roof panel
          2013BMW328i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2013BMW335i xDriveBase (3.0 L6 GAS)Notes: front roof panel
          2013BMW335isBase (3.0 L6 GAS)Notes: front roof panel
          2013BMWM3Base (4.0 V8 GAS)Notes: front roof panel
          2014BMW428iBase (2.0 L4 GAS)Notes: roof panel
          2014BMW435iBase (3.0 L6 GAS)Notes: roof panel
          2014BMW428i xDriveBase (2.0 L4 GAS)Notes: roof panel
          2015BMWM4Base (3.0 L6 GAS)Notes: roof panel
          2015BMW428iBase (2.0 L4 GAS)Notes: roof panel
          2015BMW428i xDriveBase (2.0 L4 GAS)Notes: roof panel
          2015BMW435iBase (3.0 L6 GAS)Notes: roof panel
          2015BMW435i xDriveBase (3.0 L6 GAS)Notes: roof panel
          2016BMW428iBase (2.0 L4 GAS)Notes: roof panel
          2016BMW428i xDriveBase (2.0 L4 GAS)Notes: roof panel
          2016BMW435iBase (3.0 L6 GAS)Notes: roof panel
          2016BMW435i xDriveBase (3.0 L6 GAS)Notes: roof panel
          2016BMWM4Base (3.0 L6 GAS)Notes: roof panel
          2016BMWM4GTS (3.0 L6 GAS)Notes: roof panel
          2017BMWM4Base (3.0 L6 GAS)Notes: roof panel
          2017BMW440iBase (3.0 L6 GAS)Notes: roof panel
          2017BMW440i xDriveBase (3.0 L6 GAS)Notes: roof panel
          2017BMW430iBase (2.0 L4 GAS)Notes: roof panel
          2017BMW430i xDriveBase (2.0 L4 GAS)Notes: roof panel
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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