Try your local power train/truckshop. My area has a place called Sadler's Powertrain. I took my old Hydro from my 48 with me. They measured all the ports, and other dimensions and found the appropriate one in their books and ordered me one. Had a new vac. in three days and it works perfectly. On my other 48, I installed a booster and dual res master under the floor to achieve the same thing. I too works like a charm,
Scott