Buy some hy-steer, then Make your own!!
I made my own front hanger with a receiver in the middle for a tow point. The sleeves are just tubing through you frame.
Mess around with some square tube and whatever springs your using and you'll figure it out. I designed mine after seeing a stock solid axle truck, a Sky hanger and an Allpro hanger. If you have the tools to do a SAS, you have the tools to make this stuff anyway. It should cost less than half to make the parts, especially if you alredy have some leftovers from other welding projects.
I wanted to take it a bit further, so I used some longer rear 89-94 Emu springs I had left over. These have the spring pins a bit further forward than most springs people use for SAS. The result is a front end that's about 2" further forward than anybody elses. You can also run more tire with less ride height this way since the main clearance issue is the tire hitting the firewall pinchweld area.
I did have to move the steering box so far forward that it interfered with the front body mount, but this was easy to fix with a little home fab ... no big deal. I bent up my oun shock hoops as well, but most of my buddies are using the ford shock mounts that cost about $25 a pair new from the dealer with great success.
We are all using some sort of rear toyota springs up front and 90s chevy 1/2 ton spring in the back. They are cheap, plentiful and really long so you get great flex. I also found that mounting both rear shocks rear of the axle reduces axle wrap to almost none, especially if you use monotubes.