i just came home from my local wheel shop and im happy to announce that 20 inch wheels wil fit on any 1st gen blazer WITHOUT Body Mods. so u dont have to cut the fenders or wheelwells or nething i just ordered my boze alloys 20 INCH heres a link let me know what u think the tires

P.S the tires you need to get are thin but they fit on the truck so good and it fils in the gap in the wheelwell really good too. now all i need are my fastbags and ill be set F.Y.I tire size is 255-35-20 z-rated