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You'll have to use the OEM pump gear from 951 or use an external electric pump. I have the factory pump gear on one and external pump on another trans with an aftermarker oil cooler for my S2 race car. I am not sure that colling is as important for street use, but is a must for track if you want longevity.
The port is there, so yes, an OEM unit could be adapted, but you'd need to source the loop and the internal gear, and then open it up to install the gear setup. Of course, an aftermarket electric pump + cooler could be used as well, as Nader mentioned.