Get quality aftermarket u bolts- you've already seen what Dexter has to offer right?
U bolts are easy to order, you just need a couple of dimensions and details.
Crawling under your rig and pulling the measurements is the worst of it.
Diameter and thread pitch of the bolt: 1/2x20 (3/4" wrench size is a dead give away).
Length of the bolt: measure from the top of the axle to the end of the bolt
Spread: This will be the diameter of the axle where the u bolt sits.
Bend configuration: Round, Square or Semi Round?