Left hand DCM A209 820 21 26
Right hand DCM A209 820 22 26
There are older part numbers too. This is for cars without Keyless go,
Look at the existing door controller, if there are all the sockets to plug the new mirror in, then you are fine. It looks to me like W209 may always be supplied with the fully optioned door controllers.
In theory they need coding, but theres only 3 or 4 settings and sometimes they are right by default. You will need the cluster coding to enable the 'auto fold on lock' menu item (assuming car is post MY05 facelift)
Also, it is quite likely you need a special tool for the door mirror screws, its like a security TORX with an extra spline.
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