Picked up these vintage keystone turbine mags 15x10, two have 4" backspace other two 3.5" backspace. 4 1/4 center bore, bolt pattern 6 on 5.5. Came off a 72 blazer.
My k10 has a 6" lift and a 10 bolt rear geared 3.08. Refreshed 700r4 with trans go kit.