Genuine OEM Detroit Diesel cylinder head overhaul gasket kit, part number 23532329. Fits Series 50 8.5L engines (4-cylinder). Includes head gasket with 4 fire rings, seals, o-rings, and installation instructions (as shown). NOS (new old stock) condition in original packaging. Price is firm as listed unless “offers” enabled. Unsolicited discount requests will be ignored; repeated messaging may result in blocking. Honest mistake or fitment question? Message me first, happy to work it out!