Make'em I did mine. Was more difficult than expected, well sorta.
I had an old very long set that came on my CJ. The stock shackles worked but drew comments about being skinny or weak. Troubles came in trying to drill all the holes exactly the same. I have a drill press, but was surprised to see how much the bit wandered in the thick metal. I ended up cutting them to pieces. After cleaning everything up and new drills were bought, new straight holes were drilled. I used a set of old bushings for measurement, learned to add a thick washer for extra clearance. A long hard lesson here so listen. Then Spring end and top mount need different amounts of clearance. In the void space between I welded in a squashed, to make it oval, section of pipe. Sounds easy enough. Not only are the measurements tricky, new sharp drills are a must, the front isn't the same as the back especially since I was trying to keep the shackles as short and tight as possible. I'm usually fairly good at this sort of thing. This job was started and restarted, tossed across the shop, stopped completely a couple times. Once the front was done I had to gather myself back together a couple times before tackling the rear. ..... I really like the final results and nobody will call my tank like spring shackles small or weak again.