If you have to make your own brackets, I'd get some stout angle iron and some u-bolts. In this truck it is easy to attach one end to the tie rod and the other end to the axle or you can make a mounting plate that attaches with two of your spring mounting nuts on one side. Don't drill through the axle...you can make a mount which wraps around it with the u-bolts. Turn your wheels all the way to one side and understand that will be the fully compressed or fully extended condition of your stabilizer, depending on where you're mounting the stable side of it. Attach the stabilizer to the mounting brackets and then attach them to the tie rod and axle or other mounting place. While your wheels are off the ground, turn your steering wheel through its travel in both directions to be certain you've got it right. Good luck.
Jon

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end