In lieu of the AN4 bolt that Pegasus recommends, use either an MS21250-04016 or NAS6204-16. They are built to the latest specification and 3 times stronger than the AN4 bolt.
The bolts shown above and in the links below, have a 1.0" grip. depending on the diameter of the joint and the spacers, the length may vary.
You can use the AN365-428A nuts at the other end.
You can also procure the fasteners from Aircraft Spruce.
http://www.ebay.com/itm/Close-Tolera...item1e9ff8217b
http://www.ebay.com/itm/1-4-MS21250-...00b5ac&vxp=mtr