Comp4x4.com. It arrived with two press-on zerk fittings that are slightly above each bearing race. When you apply grease, it pushed it directly into the bearing, which means you don't have to fill the housing up with grease.
http://www.comp4x4.com/Tire-Carrier-Hinge-Kit-With-Dual-Shear-Bracket-Weld-On-Version-Std.-Duty.html
If building a plate bumper, I would suggest the bolt on type of double sheer, but with the round tubing we went with the weld in type. Tire carrier can't be removed after welding on the double sheer mount, unless you cut it off. I was coming up with a way to make it bolt on, with tapping threads in the mount and welding a different plate to the bumper when Mike said "just weld the thing on already". Its his bumper, so if it needs servicing in the future, it needs to be cut off. I have been thinking about it, and I really don't see why it would need to be removed, except to redo it again. The bearings are not going to wear out since they only turn about 3/4 of a circle their entire life, and have nearly no strain on them with the double sheer mount. A bronze bushing between two tabs would probably do the same thing, just not look as fancy. The double sheer mount also acts as a stop, keeping the rack off the body. Now, the only movement in the bumper is the paper thin Jeep frame end flexing. Whoever mounted the bumper used 3/8" grade 5 bolts. Drilled out the holes to 1/2" and used grade 8 bolts. 7/16" would have worked fine, as there is eight bolts, but I had the 1/2" bolts on hand.
The spindle sleeve made it much easier to work with.
What broke was the poor design of the original mount. It had a large bolt into a threaded plug that was welded into the bumper. Also a latch type lock on the other end that was constantly coming loose because it was not straight to the bumper so it would wiggle loose. It got loose and wiggled until the bolt snapped. The latch mount was also cracked all the way around the welds, so it was trying to break as well. It was on borrowed time the day it left manufacturer, which we haven't been able to ascertain. There is no stamping, tag, nothing, to indicate manufacturer. Not too proud of their work.