You are correct but there were 15" versions of those rims in the early 60s that could be ordered on the car and came on police cars and some other versions, and the poverty cap slots and clips went back far earlier than '59 on both Pontiacs and Oldsmobiles. Early Buicks also had clips but they were riveted on. '65> may have 15" rims but I'm not sure. Someone else will weigh in.
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