Pinetree - Here are a couple of original 1957 Task Force Line brochures. One shows all the trucks with just black wheels while the other shows a mix of black and body color. Also included below is the only reference I could find on the wheel colors from the GM Heritage Center 1957 Truck data PDF.

Brochure with all black wheels on all the trucks

Brochure with the mix of jet black and body color wheels on the trucks

You described your truck as a base model 1957 3100, with no mention of single or two-tone body colors. Just IMHO, but I think you would be right to choose either the jet black or match your body color as you think best fits how you want your truck to look. It is your truck, so make yourself happy! smile
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~ Dan
1951 Chevy 3 window 3100
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