"One for the books" SB oil pump fit

So I am FINALLY making small progress. I had acquired (some time ago) a "new in the box" 360 LA "roller" that had been reman by some (I guess) local engine builder. Cam is in, got the timing cover on, and now time for oil pump.

COULD NOT find "thought I had" a new pickup. Finally realized it is still in the 'teen I had had in the car. So pull the pan--------handily it's on an engine stand

For some reason I threw the pump and pickup on the new 360. The DRIVE NUBBIN where it fits in the block..........won't fit!! Bear in mind this was IN and WORKING in the 3'teen!!!

Grabbed the new in the box pump, swapped the pickup and installed it. FITS JUST GREAT.

(Yeh!!! I primed it!!!)

So xplain?...........How many have had a pump like THAT?