nice used set that are 16 1/4 to the centers 3/8 mounting holes. a cheap way to lift the rear of a cart, or to add load adjustment with a rear seat kit.
this is a basic pump, you can find them on the net or most bike shops will have them. there about 35.00 new, the lines and fittings hook up like car air shocks or you can plumb them independently and control the pressure from left to right.