I bought the brackets and the pins for the sway bars at TSC, although I"ve seen what look identical elsewhere. There are several holes in it for the pin. One of them lined up perfectly on my TO30.
The position control kit is very good as long as the various pieces fit without too much slop. So long as the pump is running it will hold the lift arms at any height in their range. No drift at all.
If I hit the clutch for a while and stop the hydraulic pump the mower will begin to drift downward. Chains would prevent this.
I used chains before and switched to this for three reasons. 1) With chains I could only adjust one link at a time. A turnbuckle would have helped here to give infinite adjustment. 2) If I was mowing one area at 3.5" and then moved to an area I"d rather at 5" it was a pain to switch. Now I just raise the lift arms a bit and roll on. 3)I also sometimes use the 3 point with a carry-all to move stuff around on pallets. This is much easier with more adjustment in height on the fly than the chains gave me.
But, like I said, the weakness is that if I hit the clutch for an extended period the mower starts creeping down. When I release the clutch is starts too low, although it returns to the set height almost immediately. It just might scalp a point briefly.
Note the little adjustable "catch". This is great as it allows me to set a down position. It"s possible to raise the mower for a time, then drop the mower to exactly the same height as before.
I take no credit for the position control setup other than that I managed to follow the directions and adapt slightly to the scraps I had laying around my shop.