will these fit?

will 20x8 wit a 5.5 backspace work on my b2200??

no

thats only +19 offset, to tuck an 8" wide wheel you will need at least +45.

man I dont mean to beat it to death but seriously, have your hubs and axles redrilled by mike or john. You wont have any trouble at all finding 70000 styles and sizes of wheels that will tuck after that, 5 on 4.5 with +45 offset is standard for most toyota, mazda, nissan, honda etc etc etc FWD cars.