During the early 1960’s GM’s majority of truck buyers chose the base truck with few dealer installed options. It was ending an era of very limited disposable income among the average US citizen.
General Motors saw the trend toward more extras on trucks and began to offer visual extras such as two tone paint, side trim, and upgraded interiors.
Though there were limited takers, both Chevrolet and GMC offered full length stainless steel side trim during 1960-61. Note: Cab and front fender trim are the same on both makes. It is the fleetside bed trim that is a different length. On the Chevrolet, the rear “C” side piece requires this trim to be shorter than the GMC. See images below.