Don't even bother wasting your time with this kit. Bushings and flex joints will wear out very fast. Terrible suspension geometry. Your jeep will respond terrible on the trail. there is a lot more to suspension than just it having good flex.
My advice just buy a set of rokmen, savvy, metalcloak, etc. control arms. keep the current springs you have and uprgrade shocks. You will not be dissapointed. You will be dissapointed with the rough country kit though.