[urq] Voltage Regulator Module?

[Thatcher Hubbard]

My alternator is providing 12.3 volts when the car is running, which is a
pretty clear explanation of why my battery keeps going dead.

I notice that replacements are listed with both a 28mm and 32mm slip ring.
Does anybody know what stock on an '83 US-spec quattro should be?

My alternator light never came on, which isn't a surprise, I've been having
dash-light issues since day 1.  At least it's an easy fix.