Is there an echo in here?Eric wrote:The U on the fender tag designates the car was built to US specifications.Elvad wrote:They came with the car from the factory, the weird thing is the normal wheel codes are not on the fender tag, It just says "U" and no number. Another weird option on my car is bucket seats and a column shift.
Are you sure the car came from the factory with these wheels?

Assuming you haven't known the car since new, unless you've got original documentation (ie broadcast sheet or window sticker) there is no way of knowing what wheels came on the car.
As I stated previously, that wheel design was introduced in the late 70's on Super Coupes and Magnums. May have been some other applications, but none earlier than 1977.