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The bad thing about the 10" caps is they only fit '67 and earlier 4.5" bolt pattern wheels and if you want a 15" wheel, they are almost impossible to find.

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ok, next question....are they wheel specific? Will they fit either 14's or 15's? I have 15's on my 71 Plymouth and the wheels are different. It seems that it would take two different sizes. One of my wheels is like 8 inches across where the dog dish would go and the others are like 10 or so.

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Yes, the wheels are different. The earlier ones used larger caps. A-bodies started the trend toward the smaller ones and the rest of the cars followed. There aren't many choices for early 15" ones, mostly narrow widths. They came on early c-bodies with disc brakes and I find them on early A100 vans. Also came on some 1/2 ton pickups. Problem is most early trucks and vans don't have their original wheels anymore because people changed them to later ones or mags.

There is even a 16" version of the early wheel but they are very hard to find. I have them on my teardrop trailer. Took me 4 years to find a pair.