Hey Brent. I have a 61 with the custom cab option. There are 4 levels of the custom Cab, Custom Appearance, custom comfort, custom chrome, and custom side molding. the Custom Apperance option contains:
Silver-anodized aluminum radiator grille and head lamp door assembly, chrome plated windshield reveal moldings, bright metal upper rear quarter panel trim plates, special steering wheel whit chrome horn ring, chrome trimmed insturment panel control knobs, 2 tone front door panel treatment.
The Custom Comfort option contains:
A left hand arm rest, right hand sunshade, chrome cigar lighter, full 6 inch foam rubber seat cushion with special trim, special cab insulation, left hand door outside key lock.
The custom chrome option contains:
Chrome plated bumpers and hubcaps for 1/2 ton - 1 ton trucks.
The Custom side molding is if you have a fleetside you get speacial side molding.
These are the different packages you could have choosen from back then. Im sure there will be a lot of mix and match as there was in my truck. Hope this helps.
Kyle