Recommend using Someone Else....
I am not sure Greg or PRG are still actively engaged in business. I did manage to order some parts. I ordered front uca's, rear dual add a leaf for 2.5 inches of lift, adjustable shackles, and 4 degree shims for the axle.
I received the uca's, shims, and a single add a leaf for 1.5 inches of lift. I have been unable to get them to answer the phone or my emails for almost two weeks. My last communication from Greg was that my shackles were being mailed and would arrive in 2 days; that was 11 days ago. Still no idea what I am supposed to do with the wrong rear add a leaf.
shop somewhere else and save yourself the headache.