Sinister Diesel replacement fuel filter cap for 2003–2007 Ford 6.0L Powerstroke is listed as a durable underhood component intended to replace OEM plastic caps. Offered as a machined cap option, it presents a more robust appearance and aims to resist cracking compared with factory parts while matching the 6.0L Powerstroke fuel filter location.
Sinister Diesel 03-07 Ford 6.0L Fuel Filter Cap