The rear fleetside fenders on the 1955 through 1966 are usually considered the same. The reproductions on both metal and fiberglass are listed in catalogs and related advertisements are shown as being identical on the right and identical on the left. Not true!

GM modified this last year fender of the 1955-66 series with a stamped indention in 1966 to better fit the new US Dept. of Transportation required back-up light assembly. For most, it will require a long search to locate a pair of these “one year only” fleetside rear metal fenders. They probably will never be reproduced.

1966 stepside back up light