So the part came in today and to no one’s surprise, it didn’t fit , I’m just gonna have to keep trying oil pumps and returning them as I go or maybe source a used one from a junkyard or find someone on EBay that will measure the pump for me before I buy it.
Just to forewarn you, I played this exact same game with both fuel pumps and radiators. I have 4 brand new fuel pumps that don't fit, and the 33 year old OEM one still in the car. I also have 1 brand new radiator that was too long, though I did eventually source an aftermarket replacement that fit after minor modification. Rear brake calipers are gone too, so treat yours like treasure. Oh, one of the styles of alternators is also gone, as is most of the supply of parts to rebuild it. If you have a short nose XR2, you probably have this alternator.