273 New Water Pump

I need to replace the water pump on my 273. I have been to O'Reilly, AutoZone, NAPA and CarQuest and every water pump they have on the shelf for my car looks like the one in the first picture. It has that extra boss (see red circle) cast into the front of the water pump. In addition it also has a larger bypass hole and is forcing me to use the adapter in the second picture. I'm not a big fan of leaks and this looks like a leak waiting to happen.

I know I'm being picky but that is not what I have on my car now. I'd like to be able to replace this water pump with one that looks like my original (in the third picture). Does anyone know where I can get a water pump that looks like the one I have now? I'd prefer a new one but at this point I guess I could do rebuilt to get what I want.

Has anyone else encountered this issue? Am I being too picky about this?