Thanks, but I'm headed out the door right now to go dig a few Sams out of storage... and to get some beer!
I'm starting to think like the others... these are probably not the correct knobs... which is a disappointment. If I'm not mistaken, all of the other Motorola sets I've seen of that time had plastic knobs... not metal. Also, I found that one of the smaller knobs has a rounded hole with a flat side, and the shaft it was on is split with two sides. They do look good on the set, but I wish they were the correct ones.
The chassis is sitting on the dining table right now and I will start playing with it some today after I get back with my Sams.
Thanks for looking, MK.