These guys should have what you need: https://lugnutguys.com/
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Open End ET Style Bulge Acorn Lug Nuts 9/16-18 13/16" Hex
Shop for ET Lug Nuts at Lug Nut Guys. Extended Thread 9/16-18 open end lugs are great option for use with many types of aftermarket wheels and vehicles with short wheel studs. Common thread sizes 7/16-20, 1/2-20, 12x1.5, 12x1.25 & 14x1.5 Fast and Free Shipping!lugnutguys.com
What did the rear frame side shackle bushings look like?
Just put a custom thickness zero rate in that corner. I've got mismatched ones in the rear of my blazer to even out a half lean due to being in a hurry welding the spring hangers to the frame.