Opinions on these wheels and info needed

[VA72C10]

I had a guy offer me these wheels. I like them because they are nice looking, billet rims, and are one-off in 6 lug (they come in 5 lug but this is the only set ever made 6-lug...was done for a photoshoot) However, I'm not sure they're going to work. They would be going on my 70 longbed C10 with airbags and 2" blocks on stock trailing arm rear. C-notch with stock bedfloor and rear wheel wells. Stock inner fenders in front. They are 20X9 Front 5.5 bs and 22X10 rear with 6"BS which is the main part I'm concerned with. Asking him now for tire sizes. Would they work with a 1/2" spacer in the rear? I know most go with 5.5" BS on a 10" rim. I have the stock (wider) 70 rear in the truck. Also concerned with center cap/hub fitment in the truck. If they fit his should they fit mine with 6 lug discs front/drums rear? Here's his truck with the rims (newer red/black one) and the one I'm modeling after (blue)

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