O-Ring - Cylinder Head - 18.5mm - OEM - KZ1000 - KZ1100,Cut Ring Racing Head Gasket thickness 2 mm Ø 85,5 mm | Athena,Getrag 5 Speed Transmission Bearing and Seal Kit w/ Synchro,Tange Seiki Headset ZS22 ZeroStack Threadless 1-1/8,Cut Ring Racing Head Gasket thickness 1 mm Ø 84 mm | Athena