Not cut in stone but I believe the running boards were gloss black like the wheels. I can remember seeing some of the bigger heavy duty trucks running boards coming with a nearly flat black finish, but the light duty trucks were gloss.
Like the other guys said, the engine bolt on accessorys, inner skirts, core support, bracing rods, upper and lower baffles, were all a semi-gloss. I've also found that the Rust-oleum 209584 or 7798 semi-gloss black is very close to the original look.
Denny Graham
Sandwich, IL
