Get a couple of the cheap "bee hive" bump stops from you local jeep store.
If your ubolts stick up far enough above the nuts so that you can fit on another nut, you don't need to weld.
Get four extra nuts that will fit your ubolts, two pieces of plate about the size of your spring pads.
Drill holes in the corners so the plate will drop over the ends of the ubolts. Drill a hole in the center of the plate for the bee hive. Mount the bee hive. Set the plate over your ubolts, tighten it down with two nuts. If the bump stop is too tall, saw it off. Too short (like mine) add a piece of 1x1 steel between the plate and the beehive.
If you weld, drill a hole in some 1x1 square tubing for the beehive. weld the tubing to your spring pad.