Neanderthal Engineer

I cracked the passenger side main mirror and did not want to spend the $500+ that GM wanted for a single replacement mirror so I purchased a pair of the Boost Auto replacement mirrors for only $120/pair. The downside is you lose the auto dimming feature, but you gain a turn signal underneath the glass so that vehicles behind you can see you making lane changes. Your problem of the glass being too dark is solved, but you may find like I did that the headlights behind you are obnoxiously bright afterwards.