Wheel Size for 1968 Barracuda

??? I don't think Mopar ever made any 15" small bolt pattern wheels. They must be aftermarket or custom fabricated.

To determine the wheel width you need, go to Tirerack.com and look up the tires you want, then check the Minimum Rim Width column in the specs — that will tell you what you need to know.
Yea Wheel Vintiques makes them. I’ve attached photos of what they look like and you’ll see the 5x4 sbp on there

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