The big rigs have wider front fenders, with a different wheel opening to fit the bigger tires and wheels. The cabs are the same as the pickups, so cab corner repair panels should work. I believe the hood, grill, and possibly the radiator support might be different on the 1 1/2 ton and above trucks.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!