Bought them and never used them. No longer need them got a zero turn. They go on bottom draft links on a 3 point set up on tractor and hook to finish mowèr and allows the deck of finish mower to basically float. Allows more travel than if you didn't have them.  I believe they are cat 1 set up. I have a 50 horse John Deere and that is what I would have used it on if I would have found them sooner. Thanks for looking.