Features: 1. APPLICATION: Compatible with Ford 7.3L Powerstroke Diesel Engine. Fit for 1999-2003 Ford F-250 F-350 F-450 F-550 Super Duty, 2000-2003 Ford Excursion, 1999-2003 Ford E-350 E-450 E-550 Econoline Vans, 2000-2003 Ford F650 F750. 2. PACKAGE CONTENT: (2) Large & (2) Small Powerstroke Diesel Crankcase CCV Breather O-Ring Vent Valve Seals. Please double check the description to make sure this item will fit your specific vehicle! 3. PART NUMBER: F4TZ-6769-A (x2) & F4TZ-6769-C (x2) 4. PREMIUM MATERIAL: Precise machining and high- quality rubber ensure high strength and durability for long lasting usage. .