Anyone have a good source for window regulators and glass carriers, or is the best bet just buying doors out of the southwest, and crossing your fingers?

I eventually need a driver's rear-door regulator (it sort of works, but one arm is badly bent) and I've discovered that the glass carriers have a habit of rusting (over the last 50 years) and then splitting.

Thanks in advance for any hints!

-Kle.
'69 W200 Crew