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I got a set from someone on the forum for my '81. To install the mount for the spinners, you have to remove the wheel so you can screw them on from the back. After that is done, you just screw the spinner on there and tighten the screw (I forgot what type of screw its called) with an allen wrench and you're set to go.
The person I bought them from got them from Ecklers with the center emblem. Personally, I think the spinners really set the car off and make it look complete. IMO, they should have been like that from the factory. I'll have pictures in a week or so..