I'm have been looking for the same wheel, with the same results, no early 68 dates(04A car) XN code appears to be for drum brakes, XG for disc brakes cars. The Chevrolet by the Number Book doesn't list a code for drum brake rally wheels in 67 that I could find(may be missing something though) DA code in 67 is for Camaro D/B ex ss, rally. DG code Camaro SS with D/B, rally. I'm guessing the SS wheel would be 6" wide vs 5" for the standard explaining the different codes. I don't see anything about 67 wheels not being dated. The search continues. Paul