According to the 1970 Pontiac Parts Manual I have, the 1969/1970 B body Rally Wheel is code JJ. My broadcast sheet, list the Rally II's for my 70 Bonneville as JU, so I guess that was the mid-year change. The 1968 B body Rally II wheel was 14 X6 and was code JB, and I think they were still 5X5, but in 14".
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