You can get them Steve at
sonoransteel.com
No special coupler piece, just straight billy.
You can't buy just the shocks, but you can buy just the rear setup or the whole enchilada.
I bought the 7.2 a couple weeks ago and finally had a chance to try it this past weekend. I got say, "DAAAAAAAMN, what a change."
Going down a washboard road at "baja speed" and not a slip. Went over some pretty rough spots too. Just glided right over while stayin' in control. Did up hill 4lo stuff where you had to keep the speed up to get over a rock lip. Soaked up the hit with no probs. Did some slow crawlin' over rocks. Articulation was superb.
Gotta say, Steve knows his suspension stuff. Can't go wrong with it.