Replacement voltage regulators / Prestolite

[Overspendin']

Looking for a replacement voltage regulator for my Prestolite equipped A4.
The only brand I have heard mentioned is TRANSPO but I can't find a local retailer.
Anybody have suggestions for an online retailer or another voltage regulator that might be more readily available?

[Don Moyer]

We usually recommend taking the alternator and the existing regulator in to a local starter/alternator shop for a checkout and matching it with an external regulator.

Don