If you run offsets, it will stop the wheels from scrubbing into the radio tray and exhuast. Just go with the 30mm offset vintage's for the rear. Rear 30mm foams w/ 0 offset look pretty close enough to the radio tray on mine. I dont have rear exhaust like you so im not sure what the clearance is for the other side. Rear part of the body usually has a slightly bigger guards to accomodate larger rims

Im pretty sure the vintage wheels and tyres are 30mm but advertised as 31. Ive never seen or heard of 31mm wheels/tyres for sale