Cparks; according to my parts guide, there was just one seal for the wrap-around back window for 57-60 B7C-8142084B That would be channeled for the chrome trim as it was a custom cab. I don't know if the lack of trim in the seal would effect the function of the seal. A quick check shows green sales has a dozen of the seals. I have been known to give misinformation, so maybe numbers dummy (or someone else) will set us straight.