I would be wary of that swap with the presumption that your 80 uses the shank-style lugs, and your 45 rims likely has the conical style? Those shankers would bottom out before they held the rim tight to anything. Is there a reason you can't also use the 45's nuts?
99 uzj100, gx470
05 525EXC, 01 XT225, 07 TTR90, 07 CRF50