We have 4 SS style wheels with the 'YA' code and a spare wheel with 'AO' code. What were these wheels off of originally? Does anyone just have a wheel code chart I can copy? Please let me know. Thanks! Mike

Mike, YA stands for 69 SS wheels, AO is for 70 SS wheels. These wheels could have been on Chevelles, Novas and Camaros. As for a chart I'm not aware of one. Chevrolet By The Numbers might be your best bet.