In my experience with broken rear ends, the cap itself breaks before the fastener. My vote is for the preloaded cover. It's what I use on my 8.8 Ford. I thought of trying to fabricate something similar to that through the back of a 9 inch Ford housing and housing brace. Broke a nodular center section once, the caps busted in half. Ended up buying a Moser unit and those caps are way beefier.