For what it's worth, those shoulder bolts from Coan are not the best. The broach of the internal hex, is iffy, at best. The last one I used (3rd unit), I made my own spacers, out of steel tubing (like I have since 1978). MUCH better fit, and no worries about stripping the internal hex for the next builder to hassle with. Also, I personally don't see the need to add the extra 2 bolts. Any application that can sheer off 4 bolts, should have a low band apply V/B anyway.