Very nice addition! These make the rear springs and dampers feel much more snug, very crisp damping response.

My experience with the poly bushings is that these feel exactly like the stock bushings and as such, only the lower arms need be used. However, I would not use the rod ends on the bottom and stockers or poly on top...I considered this until a long aggressive drive.

I have no idea how long the rod ends will last, but I purchased a few extra. These will come off before winter...I think they will turn to pure rust if driven in winter. I expect the inner lower rod ends to wear considerably faster than all the others as was the case with the poly bushings. All the of other poly bushings are in fine shape.