Ahh...I see now.
I had been searching the websites for a 1973 - Chevy - k20 - "hub" (small bearing) and nothing came up other than bearings and seals. I also searched 1976 randomly just because I have the 76 GMC that's in my signature (also small bearing). If I would have just tried a search for my 78 I would have seen it. Apparently a big bearing is avaialbe but small isn't. I guess I will have to change my spindles as well if I go the new parts route. Thanks for straightening me out.