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No two central locking motors are quite the same across different vehicles, so getting the specifics right matters when you buy used, second hand or a replacement. Answer a few quick questions below and breakers will only quote if they have the exact matching part in stock:
The CLK was built across two generations — the W208 (1997–2002) and the W209 (2002–2009) — and the door architecture, latch mechanisms, and motor housings differ significantly between them, so W208 and W209 central locking motors are not directly interchangeable. Always confirm the exact part against your registration with the breaker before buying.
The W209 ran from 2002 to 2009 and received a facelift around 2005, which brought some trim and exterior updates but did not fundamentally change the door locking mechanism on most variants. Motors from within the W209 generation are generally compatible, but whether a pre-facelift unit crosses cleanly to a post-facelift car is worth confirming with the breaker against your registration, as subtle revisions can catch you out.
Trim level — whether your CLK is an Elegance, Avantgarde, or AMG variant — does not affect which central locking motor is fitted, as the door locking mechanism is the same across trims within the same generation. You may find cosmetic differences in door cards or interior finishes if the breaker is selling the motor still attached to a door assembly, but the motor itself is trim-neutral.
Mercedes did share some components across platforms — the W209 CLK is related to the W211 E-Class — but central locking motor housings and fittings are specific enough that cross-model fitment is not straightforward. It is possible some motors may interchange, but you should quote your CLK's registration to the breaker and ask them to confirm compatibility with the donor vehicle before committing.
Yes, nearside (NS, passenger) and offside (OS, driver) central locking motors can differ in orientation or design, so you should specify which door you need the motor for when contacting the breaker. Fitting a motor intended for the wrong side can cause it to operate in the reverse direction or not fit the housing correctly.
The CLK was available as both a coupe and a convertible within each generation, and the front door structures are broadly similar between them, meaning the central locking motor may well be the same unit. However, confirm this with the breaker against both the donor and recipient registrations, as there can be subtle differences in door build between body styles that affect fitment.