w/o Reservoir, Saginaw Pump, w/o Air Pump, w/ Pressed On Pulley, w/ Standard Mounting Threads, w/ Hydro-Boost , Original Reservoir is Metal
w/ Reservoir, Exc. Hydro-Boost, 2 Mounting Holes/Studs in Reservoir
w/ Reservoir, Exc. Hydro-Boost, Exc. A.C., 2nd Design, 1 Mounting Hole on Back of Reservoir
