Thomas, The IH site is on this forum. Just go to the "Farmall & IH Tractors" right on this forum. I think you might find someone there who will knows what pump you have.
Also, if you have oil running out the back side of the engine, then that probably is a bad engine crankshaft oil seal. These MDs and TD6s are somewhat known for that problem. Mine drips a little but maybe not more than a 1/2 quart when run all day. Al