I think I ran into that same problem and had to unbolt the clamshell and move it to get the long bolt lined up and all the way through. Then trying to get the clamshell bolts tightened up was a pain with the mount installed. I'm pretty sure I ended up grinding something down to make it a little easier.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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