Ended up buying an Enduro 22 gal Fuel Safe Cell. It has this fill plate.
http://www.pegasusautoracing.com/Ima...6X10E-PLUS.JPG

The cap is threaded. They have to make an elbow that can screw on to that, correct? Or do you have to replace the fill plate all together just to get something that a hose for remote fill can attach to?