I HAVE A CUSTOMER IN NEED OF A FUEL TANK SENDING UNIT/PICKUP TUBE FOR HIS 69 ROADRUNNER 383 FOUR SPEED CAR. i CHECKED ONLINE AND SPECTRA HAS THREE DIFFERENT PIECES LISTED. DIFFERENT LINE SIZES AND AN EXTRA HARD LINE COMING OUT ON SOME SAYS FUEL RETURN. DOES ANYONE KNOW WHICH ONE OF THESE I WOULD NEED FOR THE REPAIR? ANY INFORMATION WOULD BE GREATLY APPRECIATED. THANKS IN ADVANCE.