looks like a single bag 1st gen kelderman .. front looks different, the kelderman 2 bag on the front when i bought mine was on top of the axle with the springs flipped over

 

I had the same front dual bag system that the op had posted pics of, very similiar to the newer dual bags for our pile's. works pretty good for a highway hauler , it will give like a 4" lift, but its to low slung for a rig that see's any kind of trail usage. I was trying to sell my old front bags, but I was asking to much I think. Still sitting in the back of my dad's garage in commiefornia.