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Sounds good Bill. Take a little time on the fit of the fish mouth. As vector points out the weld shrinkage is a consideration and a good fit minimizes that. Balance the welds if you can. Weld one side and spin and weld the other. Sides first because the ends really change the angle, especially the underneath one. I use 3/8" bolts on the 7's but 5/16" grade 8 should be fine, they are in double shear.
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