Thanks guys,
I'll give the mail order system one more try, then it's off to the starter shop.
After several hours of research, I think I ended up with an AC DELCO model
2100 starter drive. The OEM number SEEMED to comport with parts numbers on the GM wiki, but I must admit that I had a heck of a time navigating those pages.
The 2100 should be here Wednesday, at which time I will check back.
Only reasons I did not go with the starter shop that's about 40 minutes away were because they ball-parked me the price of a new one for a rebuild (can understand that, over the phone), and I wanted to try this myself. We'll see if that was a good idea. So far, feel pretty good about it.
Back to you all soon,
Jim