Re: 68 Yenko Camaro rally wheel size.
Dana,
Check the Pontiac Boards under Firebird Parts and GTO Parts if nothing there post a wanted ad the JA's are on there quite frequently. Performance Years Forums
Also there could be 2 different JA stamps. There are 2 different JC stamps the 67-68 one uses a larger type font and the dates are inside the tire on the center bands. Then the 69 up which has a smaller JC stamp and the dates around the valve stem. I believe that the JA's follow the same pattern.
Good Luck... if you run into a couple of big letter JC's I could use them... 
James
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NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
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