Cheap Mercedes-Benz GLS Window Regulator

The GLS has two clear generations: the first-generation X166, produced from 2016 to 2019, and the second-generation X167, which launched in 2020 and is still current. The generation is the single most important factor for window regulator fitment, as the door structures differ significantly between X166 and X167. Always match your regulator to the correct generation by checking your registration with the breaker.

This spans the X166-to-X167 generation boundary, and the short answer is that these are different generations with different door designs, so a direct swap is unlikely to work. Confirm this with the breaker by giving them both registration numbers, as they will be able to check part numbers against both vehicles. Do not assume fitment across the X166 and X167 boundary without that verification.

Yes, this is critical — window regulators are side-specific because the mechanism is designed to fit a particular door, and NS (nearside, passenger-side left) and OS (offside, driver-side right) regulators are not interchangeable. The GLS is a five-door SUV in all variants, so you also need to specify whether you need a front or rear door regulator, as those are different parts again. Always tell the breaker the exact door position: NS front, OS front, NS rear, or OS rear.

For window regulators, the trim level does not affect fitment — the door frame and regulator mechanism are the same across GLS trim grades within the same generation. What can vary cosmetically is the interior door card or switches, but the regulator itself sits within the same door shell. Confirm the generation and door position with the breaker, and trim level need not be your concern for this part.

The GLS X166 received a facelift update during its run, though whether this affected the internal door regulator mechanism is not something we can confirm with certainty. The breaker will be able to compare part numbers from both registration plates to tell you definitively whether the regulators are interchangeable within the X166 generation. Provide your exact registration and ask the breaker to cross-reference before buying.

All production GLS models are expected to have electric window regulators as standard, but whether any mid-range specification changes affected the specific motor and regulator assembly is something you should confirm with the breaker against your registration. The mechanical frame of the regulator is the primary fitment concern, but the motor and wiring interface must also be compatible with your door. Give the breaker your registration so they can match the correct assembly.