sorry guys i am coming over from the dodge section, but anyway i was searching and found a couple articles about putting the procomp 13711 springs on the back of my power wagon, well i ordered them but they arent in yet i was just wondering what they are originally for( i know the rear of a chevy thats it) and wha is the overall spring length and also what is it front front center hole to the center pin?? an help greatly appreciated, thanks in advance