Sinister Diesel Oil Fill Cap 17-23 GM 6.6L Duramax | 11-23 Ford 6.7L Powerstroke. Fits: 2011 - 2016 Ford 6.7L Powerstroke; 2017 - 2019 Chevy/GMC 6.6L L5P Duramax; 2017 - 2019 Ford 6.7L Powerstroke; 2020 - 2025 Chevy/GMC 6.6L L5P Duramax; 2020 - 2026 Ford 6.7L Powerstroke.