A set of Firestone 2500 or 2600 can be bought on Amazon. I run 2500 rear and 2600 front. Think there is more lift out of 2500. Look at Ride Tech kit, what I have for rear. There is a cup that takes 2 bolts to one nut to mount thread to spin in stock spot. Keep bags separate on Schrader valves.
http://www.ridetech.com/store/1963-1...ar-system.html