If memory serves me correctly, the 2071 kit is universal (Fits alot of applications) and mounts to the outboard side of the frame, I have this kit on my 96 with a slight mod for the 5'er hitch rail mounts. The 'other' kit replaces the bump stop. This is the style I have on the '07. 5. Both kits took less than 2 hours to install and with the exception of doing a little bit of welding on the 2071 for the 96 was very easy to install. I am also not a believer of "having to keep the bag inflated to 5 psi" both installations run 0 psi when not loaded, the 96 has been on the truck for 170,000 miles and there is no notable leakage, the 07. 5 has and auto leveler kit installed and is set to keep the truck flat (Sort of like a leveling kit) when it is loaded. I have installed many ride rite and air lift systems in my time, IMHO I prefer the ride rites.
By the way the 07. 5 has overloads and the 96 does not.