Mercedes-Benz SLK Window Regulator Replacement Parts

The SLK ran in two well-established generations: the R170 (1996–2004) and the R171 (2004–2011), and these are different body structures, so regulators are not expected to cross that boundary. Within each generation fitment is generally consistent, but if you are buying a part that sits right on or near that 2004 changeover, confirm the exact generation against your registration with the breaker before purchasing. Never assume a part from one generation will drop straight into the other.

Yes, side absolutely matters — the driver's door (OS, offside, right-hand side in the UK) and the passenger's door (NS, nearside, left-hand side) use mirrored regulators that are not interchangeable. Always tell the breaker whether you need the NS or OS unit, and double-check this against your own car before the part is sent. Ordering the wrong side is one of the most common fitment mistakes with window regulators.

The SLK is a two-door roadster throughout its production run, so all trim levels share the same door shell on a given generation, and the window regulator is a door-structural part rather than a trim-level part — the engine or badge does not change it. Whether the regulator is electric or manual, and any mid-range specification changes within a generation, are things you should confirm with the breaker against your registration, as these details can vary. The key details to give the breaker are the generation (R170 or R171), the side (NS or OS), and your registration number.

The R170 generation ran from 1996 to 2004, so a 1996 and a 2003 car are both within the same generation, and fitment is generally expected to be consistent across those years. That said, confirm the specific part number with the breaker using your registration, as minor production changes can occasionally occur within a generation without a formal facelift. Providing your reg to the breaker is always the safest approach.

This question spans the R170-to-R171 generation boundary, which falls around 2004, and that changeover involved a completely new body — so parts from either side of that boundary are not expected to be interchangeable. A 2004 car is R170 and a 2005 car is R171, but exact build dates around this period mean you should confirm which generation your car actually is by checking the registration with the breaker. Do not assume fitment across this boundary without that confirmation.

No — colour is a cosmetic preference and has no bearing on window regulator fitment whatsoever. The regulator is a mechanical frame-and-motor assembly inside the door, and any interior trim colour differences are entirely separate. Focus on getting the correct generation and side (NS or OS) right, and leave colour out of the fitment conversation.