Hey I have my rear end in not finding rims tires I want for it. And my trucks couple hours away I been working crazy but here's thing I'm trying do math here I found tires rims there 4.5" back spacing with 10" tires so if I'm adding right it going be 5" back spacing I have a rear end 573/4 and wheel spacers 1.25 and putting rotors on for disk brakes not sure how thick they are but I'm thinking going be 573/4 + 2.5= 601/4 - 10" = 50 1/4 from inside tire to tire can ppl tell me is it going fit in my 49 chevy pick up ?