genuine only for this part
Don't bother with the cheapies, they will fail in a month. The genuine is made by lk in germany. If you take it apart and look, the contacts are solid silver. The cheapies are silver colored, but just brass . The genuine seem to take more overload abuse than the knockoff's and will be much more durable. If it says Mercedes, has the star, is made in germany and/or has LK's logo. You'll be ok.
(you still better take apart you window/regulator and lube the slides and align it, or it'll burn out anyway)
Tip: Don't use ep grease. Use normal general purpose , or "white" grease. The EP stuff is great for closed areas that get re greased regularly, but has a short life when exposed.
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