Thanks guys. Jim Carter sells the clutch head screws same as in Tim's link above. He has the 51 and later rivets listed wo/ a picture, and a note that they are on backorder. Anyone else have the correct rivets available? Could a guy find these at a hardware store? How are they installed? I seem to remember a discussion recently about those rivets, but can't remember where. Thanks!
The Filling Station has them. I just ordered them last night, and they apparently in stock, as I got a shipment notice this morning.
Gord, I once had a Model A body that was held together with Robertson (square recess) fasteners. Seems like they used a lot of them back in that era (late 20's - early 30's).