ride tech -kit for c-30 info ??

[wahl4m]

anybody install a ride tech rear air kit on a 74-90 c-30 1 ton dually truck ? im looking for a used kit and or pics of this kit installed -im trying to drop the rear of my p-30 bus frame ? i seen on line a place called "bones fab" did one and looks like part of the kit gets a weld in crossmember ?? i cant seem to get much info from "ride tech " of coarse i want a non company opinion of installation and after comments ?? i suppose i need to contact this bones fab and see what his is -sure looks good on line !! any help guys ?? thanks