Welcome,Spanners! My friend has two P.T.O.'s available,since he turned his flatbed/dump project,into a 4X4. The SM 420,in his application,came out of a ,(I believe),'69 C-65. It has P.T.O. mounting plates,on BOTH sides of his trans. Nice set-up,in case you wanted to "run" a pump for the hoist,and another P.T.O.,for a winch. his,(as I remember),are 4-bolt mount. If interested, send me a P.M., and I can take pic's,and find out what he's asking. They're both single-speed.