Stay away from 2 links, they work but not very well. If you are building a trailer queen then go for it, if you plan on driving the truck still with a triangulated 4 link or wishbone, or parallel 4 link with a locating device like panhard bar or watts link.
2 links put to much stress on the axle and frame, and they have terrible pinion angle change. I installed one on my truck to get some first hand experience with them and they are just as bad on the vehicle as they are from and engineering perspective.
I offer a few different styles of weld on 4 links and a couple bolt on kits as well. If I can help you parts email me
brian@illusivefabrications.com