The data that I have collected shows that all the fenders I have seen up to fender date 1/19/1968 or car build date 01E had the extra hole on both fenders. The only anomaly is a 2/26/1968 fender that had the extra hole on the LH fender. I'm sure there were a few straggler fenders put on out of sequence. So I would say the crossover time was late Jan 68 to mid to late Feb 68. Every fender I have seen from March 68 onward does not have the extra hole. Also, NO 69 fenders ever had the extra hole.
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