The bolt for the pin should be available through Mopar, sometimes the bolts are not horribly over priced. You will probably want to get the bolt for the year of the rear end you are using, just in case they changed the thread count or something. For a lot of the older rear ends, that pin locking bolt had a 5/16" head, and I have bent 5/16" wrenches removing them. A guy is probably suppose to heat the threaded end to soften the Locktight.
As far as the bearing retainer locking tab, if its laying flat, it almost has to be in the hole. if its not in the hole, the edges will not allow allow the tab to lay flat. Just be sure the tab isn't bent so it lays flat. Gene