Which single-wire alternator to get?

[CentralCoaster]

Previous owner put on a Powermaster 8002 alternator, its dead. It's advertised to fit 1967-1982.

I want to replace it with something from the parts store. (I don't like having consumables on the truck that require special order to replace.)

What will fit? The ones at the local store have plugs for the regulator. Yet they claim to have an internal regulator. My truck just has the single wire from the battery.

Is there no such thing as a single-wire alternator that is an original replacement item? I may try Carquest tomorrow, they're more likely to know and dig through some boxes for me. I honestly don't know much about alternators. The one in my vette is 25 years old and original!