You mean the rear sliders to replace the shackles?
The Hotchkis leaf put the rear very low. I was not able to run their supplies dropped front hanger because it put the rear too low. And the pinion angle was sky high. The sliders put the rear spring eye up higher.
Correct about replacing the shackles. To be honest the sliders are a new to me and I have them on the list at the advice of a couple of members on here. I am looking to get the car to function on the road as best as possible.