For those that no longer need the water in fuel sensor plugged into the bottom of their fuel filter, you can use a Fleetguard FS1251. This has a drain at the bottom. The other one is a Fleetguard FF5052, this has no drain. Both of these filters are common to the 4BT and early 6BT. They are the same size as the one called out for the Dodge 6BT