John, sure do. My '64 step has no indentations, nice and smooth rear fenders. My '66 step parts truck has indentations for the backups. In fact, I'll be cutting off the 66's right side indentation and fitting it to my '64's fender, as the '64 fender is in a lot better overall shape. Maybe yours were actually earlier year fenders modded to update to the backups?
I'll try to get some pics later today.
