External oil pump pickup pan mod...?

Don't think that would work in this application. The bulkhead fitting screws into the pickup that sits flat on the bottom of the oil pan. The Milodon fitting shows an o ring and flat washer that I guess goes on the outside of the pan - like a drain plug - external sealing?
I put o rings in and out, w/ a sealing washer against both. Nut on outside, swinging pick up on inside. 90 degree pointed to the front, 45 on the pump plate to line up, straightest shot possible on the big line . No problems w/ oil drain back, oil pressure comes up immediately on start up.----just sayin