Genuine Kawasaki PartFits the rear brake calliper.Small O ring for the calliper halves43049-1004 Rear Brake Calliper O RingSKU: 430491004£3.86PriceQuantity*Add to CartBuy NowThis Part fits the following modelsZ650 C1-C2-C3-D1-D1A-D2 Z1000 B1-B2-B3-B4-E1-E2-G1 Z1300 A1-A2-A3-A4-A5-B2 ZG1300 A1-A2-A3-A4-A5