I think the one on my car is as long as the ones in the summit and Jegs catalog. If you look really closely, you can kind of see where the end of the fitting goes to in the tube on the way to the water pump. The tube seems to be perfectly straight and then makes a abrupt turn to the connection to the water pump. It looks to me like there is not very much space between where the fitting ends and the water pump starts. I have a long pump so that gives me a little more room to allow for the longer fitting. I don't know if it would work with a short pump or not.
Also, Brian, I would like to pretend like I know what a nail head is also and just wait for the answer, but I must confess I dont know either.