Replacing my rearview mirror

[Roa, Greg]

Hello all,
I need to replace the rearview mirror (windshield) on one of my 4kq's as it is delaminating.
The question is, are the mounts for rearview mirrors standard from car to car?
It's hard to find good 4kq rearview mirrors, but I could probably find a good one from a newer Audi.  Or, could I use one from a completely different make of car?  That would be wonderful.  All kinds of possibilites there.  I could always pull the mounting tang off of another make of car, and transplant that with the mirror, but I'd rather not have to rip the one off of my windshield.

Thinking about heading to the junkyard this afternoon, so thought I'd ask.

Thanks!
Greg Roa
Cincinnati, OH
86' 4kcsq x2
87' 5kcstq
93' 90CS
83' 944