Hi Benz Dr, This what you can use, first solution is ,i have forgotton what is called,
but it is the black very fine light canvas,with a sticky back that is used on convertible top
rubbers, i still have a good size roll from my days with Cadillac and Buick, cut with sissors,
to the size you need then peel off the paper back,its marvelous, infact im going to do my
rubbers on the Pagoda ft window surround rubber soon,its the original and it wears off to a
cream -white colour instead of instead should be black.
Second solution is a very thin cork rubber base gasket that is less than 1/16 think,
apply a fine layer of contact cement its also very good.
Let me know if you require a couple of these pieces for your mirrow,i could send them to you regards.