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Not sure why the wheels on this 1981 are different, (the spacers are tapered on 2 of the wheels and not on the other 2) I was recently at a car show and was looking at a 1982 and noticed that 2 of the wheels were like one of these pictures and the other 2 were like the other, I asked the owner if he knew why his wheels were different, he didn't have a clue but looked upset that they were .........I told him sorry about that and moved on.
Interesting. I'd bet the inside of the wheels are stamped differently. Differen't years? Differen't maker? Aftermarket?
My '79 wheels match your first picture....almost.
On my '79, the "spokes" are all the same and the wheels all look the same as your first picture. They even have the same identical stampings on the inside, but the center inset where the center caps snap on is slightly different on one of mine.