I can get 295/65 MT Drag Radials in there with the helpers on. Can't without them. And I can adjust the weight very accurately side to side with them, too. That was a big deal back when I was racing KOS at the local track.

They use the front mounting point as an anchor to pull the rear of the spring up. They do work and still let the Cal-Tracs do their thing on the front segment. I had thought about removing the short leaves in front to see how the Cal-Tracs liked it, but never got around to it.