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I had to go with 1/2" on the rear in the duster since someone screwed up 1 axle trying to put RH thread studs in it. I just went to napa with a stock 7/16 stud and found a 1/2" stud with a slightly larger knurled area and drilled out the axles with a hand drill. The OE 1/2 mopar lugs had a much larger knurled area and would be real close to the outside of the flange.

Mic the shank on the 7/16 lugs and order 1/2 lugs with the same shank size, The studs I used were for a ford truck, about 2 3/4" long. I may be able to get some measurements in a few days cause there's a 50/50 chance that I'm getting it back.

If your axles are ok there may be a long 7/16 for GM apps since they're all 7/16, it would save a bunch of work- EDIT moroso sells long 7/16 studs, about $11 for a pack of 5 but you need to find out the knurl size on the stock lugs first- they have .480" and .560".

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