METCO Shelby Fuel Line Adapter 2007 and Newer Shelby GT500 This custom adapter is part of the Metco Motorsports fuel rail adapter kit (PN MFRS2000) used with Metco fuel rails. This is the stainless fitting that mates the high-pressure hose of the MFRS2000 to the factory fuel feed line. This adapter is CNC-machined from stainless steel and has a barbed end on one side for the high-pressure hose of your choice, and the opposite end is configured to mate with the original fuel feed line. We offer this adapter separately for users wishing to design a custom fuel system for their vehicle.