Well is a winter project; adapting to graft a flip open gas cap to a 67 Dart.
What I don't know is if the mounting distance from the flange that bolts to the quarter panel to the end of the pipe (gas cap) is the same for both the Dodge and Plymouth pipes. I am assuming (relying of memory and that is shaky) that the pipes are basically the same as far as the bends/length.
Looks like I need about a 1/4 inch additional length for the cap to clear.
Still toying with gas mods (thicker gasket),
'64 Dart