Hi,
When I bought mine, I ended up buying a complete mirror from e-bay, I don,t believe they knew what they had as i got the entire folding mirror assembly with the dimming glass for £50.
I would keep an eye on e-bay for the same scenario, as I have seen several go through as complete assemblies for £60ish.
Don,t forget the prefacelift 210 E class mirrors are the same as a 202.
Did you have dimming rear view mirror and drivers side glass as an option on your 202 from new? or are you retro fitting it?