Didn't the earlier B-Series cabs have a rounded back for the round nosed trailers?
@Rodent Also, back in the 1960s, if you wanted to haul Ford cars, you needed to use a Ford tractor. Same with GM or Mopar.
Does anyone know where I might be able to find grill guards for a 1996 Chevrolet C3500? I've checked several of my "usual" sources (Iceman Collections, VGC Resins, Texas3DCustoms, & Cults3D) without much success. Lots of Ford stuff, though.