Fantastic...I thank you. This explains why there is so little on the subject. I'm leaning towards global west poly pads. The factory originals are pretty chewed up, I don't think factory rubber will hold up long.

Thanks again Jason. Much appreciated.

Steve. I wouldn't use anything solid there unless the car is only ever driven moderately in a straight line. The leaf springs act as both the lateral and horizontal locator for the axle. When the car pitches into a corner, the leafs must be able to camber side to side to allow the axle to arc as needed. In that regard the leafs being tied together by the axle also act as a pseudo anti-roll bar, with the rate being determined by the amount of "give" that the isolation pads provide. Adding solid pads would be like adding a rigid sway bar to the rear. It could be dangerous for a street car and it may add quite a bit of NVH as well. I would go with a good rubber, or poly pad.