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I believe they're 7/16 from the factory on my 89. I got the ORD bushings and shackle kit and those are 1/2", just make sure that the sleeves in the bushings match the bolt diameter. FYI - The ORD bolts are drilled and fitted with grease zerks (sp?).
Yep, those are the right sizes. The 9/16" bolts on the front are 5" long, and the back are 4 1/2" long. They are grade 8, and use Nylok nuts. I had to buy mine from a fastener supply company.