Rear View Mirror glass was resilvered by a local mirror re-silverng shop --- this let me keep the original glass and bevel, since the retaining clip for the mirror is designed to snap over the beveled edges on both top and bottom (across the width of the mirror). The only issue in re-silvering (besides finding a good resilering shop) is that the paint used on the resilvered mirror has to be weather-proof -- the housing is not weather tight ('67 250 SL chrome housing), so condensation occurs inside the housing when you drive around with the top down.
Be careful you (and/or the resilvering shop) don't scratch the mirror glass ---- it's pretty soft glass.... and resilvering won't fix it.
Re-silvering cost me $20.
BTW, while I had the whole rear-view mirror and bracket apart I had the pieces rechromed... the pig-metal bracket was especially tarnished. If you have the housings (front and back halves) rechromed make sure to tell the chrome shop that the edges (mating edges of the 2 halves) can't be plated up too thick or you won't get them back together without bending something in the process. That was a hint from a local high end (300 SL's etc) full body up restoration shop where I get my advise and cousel.... and it turned out to be good advice ... the 1st pass by the chrome shop was too thick... they had to re-do (at their cost the 2nd time 'cause I made them write the thickness restriction on my order form the 1st time).
Anyway, my mirror, mount, and bracket is now show-room fresh again.. pit marks gone... smooth as a baby's butt, and brilliant. Quality triple plate (Ni, Cu, Chrome) is the only way to go.
Longtooth
67 250SL US #113-043-10-002163
95 SL500