Hmmmmm...been thinking about sliders for a long time, but didn’t want to weld them to the frame. The bracket you made solves that issue. Wish I’d have thought of it.
Yeah the bracket just bolts to the original shackle mount. With the slider even with the bottom of the frame horn the car ended up about 3/8” lower than with the stock shackles.
The bracket itself is just a 3”x3" x.125" tube cut at an angle with an 3/16” plate welded to the bottom. If I had it to do over again I'd make the bottom plate 4.25" long and cut a little different angle on the tubing, the slider ended up a little further forward than I'd planned. It is also offset a 1/2" to match my 1/2" offset DoctorDiff front hangers.
Calvert also makes springs sliders with a built in angle. Best practice would be to have the slot in-line with the angle of the leaf spring. The AFCO sliders I used have a flat slot, so ideally I would have built a bracket with a little angle. Or used the Calvert's, although the angle they use is generic.