I know this won't be for everyone, but thought I'd post it anyway as there are many "semi-traditional" rods on here. I'm running a traverse rear spring with.....a traingulated four link. Anytime you mount the rear spring to a flat crossmember, the spring height and/or ride height shims move the axle to the rear due to the frame rake. Plus with all of the adjustability in the four link I wanted to be able to adjust for any spring binds. You could also use this on a traditional transverse spring if you just needed to tweak the wheelbase to get the tire better adjusted in the wheel well opening. Anyway it's just a rear shackle that is wider than the spring that will accept spacers to adjust the spring to perch relationship. In my case it's 3/4" wider. The picture showes the worst case with all of the 3/4" adjustment on one side. You could run spacers on both sides to get something less than a 3/4" adjustment.