I don’t think I fully transported the portion of my cars thread covering my experience with these to this forum but it was quite a task. The big problems you’re going to run into is the bolts will likely be rusted into the IRS bushing sleeves, and if they aren’t there’s the possibility they’re rusted into the captured nuts in the frame rails causing them to just spin and spin.
Before you tackle replacing those brackets, prepare yourself for the worst; new (good used) bolts, new (or good used) IRS bushings, (good used) top cups as those tend to be as rotted as the stabilizer brackets (not needed if you got aftermarket delrin bushings) and be prepared to cut a hole in the sides of the frame rails to access the captured nut(s) if they end up spinning.
If I didn’t prepare for the worst having those parts on hand I probably would have had my car stuck on jackstands for a month