Welcome aboard! You should be able to get all of the parts from the flaps (freinldy local parts store), Napa would be a good place to start, or if you have locally owned place that's been around for a while, they might have them, too. Advance, O'Reillys, and Zone might be able to get them, but they will probably try to sell you a whole new/rebuilt unit.
One thing I can say about napa, if you use them, is that if you get the Napa/Echlin regular for the alternator, you will be pleased with the performance. The Echlin regulators are using the same technology used in the newer GM cars, much more accurate then the originals. I swapped out the regulator in the alternator in mine for one. Made a huge difference.
