I have an extra set of the Russel EFI push connect fittings; but keep in mind that many have the OLD design, which uses a regular plastic center clip. These CAN and HAVE come off before under rail pressure. I had a return line fitting come off and pump fuel onto hot headers.
YOU NEED TO USE 644110 or 644120, these are the NEW design parts for 3/8 and 5/16 push on fuel fitting to -6 AN. Some have used the old style for a long time, but there has been more than 1 car lost to a fire caused by the fittings.
http://www.summitracing.com/parts/rus-644120/overview/
http://www.summitracing.com/parts/rus-644110/overview/
If you want the old style, you can have my set for the cost of shipping....but frankly thats at your own risk.