Cometic Complete Gasket Set For Harley Sportster 1200 Features 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 made for any builder who demands the best and appreciates the long-term value for his/her dollar Replaces OEM 17026-91C