If you go with the widetrack version, then a great match is a rear Dana 44 from a 95ish v6 Isuzu Rodeo/Honda Passport. It's got disk brakes, same width and 6 bolt pattern as the widetrack Jeep, and comes with either 4.10 or 4.30 gears. The only glitch is the flange needs to be swapped for a U-bolt flange.
Height numbers for springs are always a crapshoot. They all have a "range".
Yeah, the hellcreek website isn't the greatest. :dunno: check the thread in the classifieds and send him a PM with your needs. :thumbsup: