Spacer time!
Not right not tight, the shackle hanger just isn't wide enough on the inside of the frame maybe you can see it here. If I were to tighten it, the shackles would not be straight if I tightened,(smaller on the top) and would be rubbing on the frame,
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I dont know why, but that truck just looks good.
Did you chisle the heads off and then hammer them through?