I used that kit when I bent my passenger side bracket. The driver side that the original post had just presses into the driver side after pulling the stock bushing out.
If you can weld, welding the passenger side is pretty easy. You do not cut the hole bracket off and then try and line up the replacement and weld it in place. Borrowing mrblaine's picture. You cut the top of it off (along the red line), and then that solid bar sits in the middle of the old bracket, making it self-positioning. You then run a weld bead (along the yellow line). I sold that Jeep otherwise I'd take a pic.
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I do admit though, mrblaines solution is pretty slick.