33Chevy

Doing a conversion and need a double female junction to connect two GM return fuel lines. I believe they are 14 mm X 1.50, the type with small O-rings (ie 5/16").

Need to connect (2) return lines as in the attached picture.

Wouldn't mind having both 16 mm and 14 mm X 1.50 junctions...haven't had any luck locating them.

Thanks