Cometic Gasket CG-C9952 Engine Gasket Kit for Sportster 04-06 w/1200cc EnginesDescription for Cometic Gaskets Complete Engine Set EST (Extreme Sealing Technology)gasket kit contain MLS head gaskets, steel Viton coated base gaskets, blue Viton valve stem seals and AFM material Other features include the race style exhaust gasket, that won't fray into the port, and the one piece Evolution rocker box base gasket which is made from a single layer of . 020" thick embossed Viton coated steel Complete engine gasket set EST kits are