[bigblock73]

Ok, more info

All rims are 9" wide actual...I measured them. I just call them 8" like everyone else.

Stampings on the wheels are as follows...

wheel 1
XAJ 7/28 mfr date 1984 41

wheels 2-4 (round hole)
XAJ 6/16 mfr date 1984 41
OK 3/31 mrf date 1910 40
BM 9/26 mfr date 1910 40

These are def all GM wheels by looking at the stampings and location.

What does the first set of letter indicate, and what do the last two sets of numbers indicate...anyone know?

I am very surprised most of you have seen/used the round hole wheels on various trucks with no problems, my '75 can't be a 1 of 1.

Really bummed right now, and if I machine the other 3 out...it's gonna bug me I have a mismatched wheel, despite not even being able to see it with a center cap on...lol. I need help, I know.