I messaged the Ebay guy and he told me that his is the correct one I need (1/2"-20 threads into the box). I'm pretty sure the Bouchillon fitting is for the earlier (up thru '69) PS pump. Anyway, Bob, AKA 4speed Fish, came over and put one in that he had. He told me that he had gotten it from the Ebay seller, Rehlenberg.