Threaded pipe cap that screws into a nut in the lower pipe...
Can ya see it... How about now?
The cross bar has an open piece of 1.5" pipe welded to the end. The drivers side 1.5" uprite has a nut welded into a washer and caps off the top.
I then took a piece of 1.25" pipe X 2" wide and sleeve the OD to fit nicely inside the 1.5 crossbar end. Once I did that I welded a washer with a bolt on the bottom, the top I welded a cap on. This screws inside of the crossbar end and holds everything in place.
I did drill a hole through the cap so I can tighten it down firmly and there is a tab welded on the crossbar so I could put a padlock on it if I choose too.
I used the OEM tire carrier but welded a piece of 3/16's plate to the crossbar for it to mount to. It supports a 33 - 36" tire easily. If you make this style bumper you will have no more damaged rear corners because the uprites protect them. I have similar uprites on the front bumper as well.