you can go 12 wide if you want, i have 18x11.5 on my 68 and i have room for 13's if i wanted, however i rolled my 1/4 lips hard.
with the dse 4 link you can run tighter tolerances, like 1/4 or so.
with a stock width axle and a 11 inch rim the bs should be around 7.5
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