They made the wheels for the tires avalable at the time. The car manufactures did not design the cars for wheels and tires that were not avalable yet. They made a 15X8.5, it was probably used for drag slicks. A lot of the bigger tires avalable in the 60s were 14 inch, not 15s. I have a US TT wheel that is 15X8.5, it fits on the rear of a 1970 Lemans, if I try to fit the wheel on any Pontiacs built in the 60s, it sticks out of the wheel well.
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