The 5/16" line seals are the same as those used on the 6.9 and 7.3 IDI fuel filter outlet--E3TZ-9K260-A. The 3/8" one on the regulator/filter return fitting is the E3TZ-9C387-A. Ford also has a kit with four 1/4", one 5/16", one 3/8", and a couple of o-rings f... Login to read more.