That's interesting Brad. So according to the P&A, 333590 superceeded the 3952700 wheel (which happens to be the 1969 Camaro NK1 and the 1969-1975 Corvette wheel).
It was also used on the 69 Buick, but does it say which model?? That can't be for the GS since the GS used the "Thumb Grove" wheel. As a matter of fact, there's a
333590 WHEEL on ebay right now, and it's clearly not a "Thumb Grove".
So what's the 9752131??
Ed