Might Bid on some wheels, check this out, I need help

[Jb325is]

I might bid on these Borbet Type S' theyre probably going to be pretty cheap, and they might look good on my car, but then again they might look like shit. I dont know what the bolt pattern is, I know its 4 lug and off of a 1985 Audi 90,are they 4x100?also Its a 7.5 in wheel with 3 in backspace, so what does that make the offset?
Thanks

[decay]

the 90 wasn't introduced by audi until 1988, and used a 4x108 bolt circle for all equipment levels.

if they are from a 1985 4000, they could be either as the base models of the 4000 (the then-current model) were 4x100 and quattros were 4x108. if they're from a 5000, they'll be 4x108 either way.

email the seller and ask for clarification.