Motorcraft FD-4641 a diesel fuel filter is similar to FD-4625-AA, the unique difference is that FD-4641 does not contain the fuel line collar. Selected 2020 6.7L vehicles come equipped with the fuel line collar. The collar is reusable. IF YOU HAVE A 2019 OR OLDER 6.7L, YOU MAY STILL USE THIS KIT IF YOU DO NOT WISH TO REPLACE THE FUEL LINE COLLAR. FEEL FREE TO MESSAGE US WITH ANY QUESTIONS. Details: Unit of issue of 1  Fits selected 2020 Super Duty 6.7L Diesel V8 Turbo