If you can't find them locally, they may not be so cheap.
I found a pair of them on ebay (front and rear) currently bidding at $700 for the pair, off a deuce and a half.
Norm, what's the width of these things? Looked like it had drums all around. How do you get new shoes for these?
Vision: Big Norm pulls up to the local hardware store, young pimp/punk inside talking rice burner talk asks him what he needs. Big Norm replies "need some new drum shoes for my truck, oh and a new tie rod end."
young punk replies, "fer wat?"
Norm: "deuce and a half"
Young punk "fer wat? uhhhhhh, we ain't got none fer dem. Out o stock right now. (yeah right!)"
Anyway, no offense to you more knowledgeable young guys or gals. some auto stores seem to fill their shelves with totally clueless young kids. Point though is finding parts would not be nearly as easy.
Norm, further....quote concerning these axles on ebay..."front axle weighs 790 lbs. and the rear weighs 680 lbs". Better find these local. You'd be shipping the weight of a small car, like a Yugo! I think you need to start asking questions about your drivetrains ability to move these massive gears/axles. I know they are geared at 6.72, but I would think the Bronco driveshafts/ujoints would need upgrading, you need a better, all steel T-case, and what about hanging these bad boys? Think some thought needs to go into proper springs and what not for such a massive amount of unsprung weight. D60 is more heavy duty than 1/2 ton stuff, but a D60 weighs not even half what that front Rockwell weighs.