Keystone BM1350121 Front Left Power Window Regulator Without Motor OEM Replacement

The Keystone BM1350121 is an OEM-style replacement front left (driver side) power window regulator designed without a motor, engineered to restore proper window operation to compatible BMW X3 and X4 models. This regulator replaces BMW OEM part number 51337355635 and is built to match the fit, form, and function of the original factory component.

Window regulators are the mechanical assemblies responsible for raising and lowering door glass. Over time, the regulator's cables, tracks, or carriage can wear or break, causing the window to become stuck, move sluggishly, or drop unexpectedly. Replacing the regulator assembly restores smooth, reliable window operation.

Key Features:

• Front left (driver side) power window regulator
• Regulator only — motor not included; reuses existing motor
• Direct bolt-on OEM-style replacement — no modification required
• Engineered to match original equipment specifications for proper fit and function
• Replaces BMW OEM Part Number: 51337355635 (also referenced as 51-33-7-355-635)
• Compatible with BMW X3 (F25) 2013–2017 models produced from April 2013
• Compatible with BMW X4 (F26) 2015–2018 models

This regulator is a motor-free assembly, making it the ideal solution when the regulator mechanism has failed but the original motor remains functional. As a Keystone replacement part, it is built to collision and OEM replacement quality standards for a dependable, long-lasting repair.