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THEY MOST LIKELY USED A 14X6 68 GTO/FIREBIRD WHEEL WHICH HAS THE CODE [JC] AND I BELIEVE THEY CHANGED THE INSERTS WITH A SPECIALLY MADE ONE.
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While I don't know what the codes were, i was told that the wheels were 7 inches wide, and were selected because it was the cheapest 7 inch wide "mag style" wheels that Yenko could purchase. The center cap was specially made with a red "Y" instead of the PMD logo. No trim rings were used.