On my Cobra replica AXing on 315 A7s I ran 1 inch spacers on the rear for several years. I got Eibach hub centric. They were the style intended to bolt to the hub and then the wheel bolt to them. Expensive but I felt real comfortable using them like this. I knocked the short studs out of them and slid them on the 3 inch ARP studs using the holes that were originally intended to bolt them to the hub. I used the included slightly thinner nuts to torque them in place. So basically I had a wider rear axle. I figured the empty holes where the studs used to be were lightening holes.
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