Cometic, EST motor only gasket kit. 4.125" bore - 99-17 Twin Cam (excl. Twin Cooled). Incl. 99-04 early valve stem seals and 99-10 style breather gaskets (NU) 959563 OEM replacement reference 59031-83 and

OEM replacement reference 59031-83 and 58998-83B

bolt-on and U-clamp style

Fits: > 08-21 FLHT

S&S strongly recommends that the stock chain drive be upgraded to the S&S gear drive or to convert to the 06-up hydraulic chain tensioners

Long Sleeve

Cometic, EST motor only gasket kit. 4.125" bore - 99-17 Twin Cam (excl. Twin Cooled). Incl. 99-04 early valve stem seals and 99-10 style breather gaskets (NU) 959563 OEM replacement reference 59031-83 andWith . 036" MLS (Multi Layer Steel) 4 1 8" bore head gaskets. With 99 10 style breather gaskets & 99 04 early style valve stem seals. This EST (Extreme Sealing Technology) gasket sets are complete with all gaskets, seals and o rings that are used on the specific H D model that is mentioned, excluding primary gaskets. It's the easy way to do a complete overhaul and have all gaskets that are necessary in one package to reassemble the engine. This EST