These are Cylinder Reserve Caps available for the following model: - GSXR 600 (00-05) - GSXR 750 (00-05) - GSXR 1000 (00-05) - R1 (98-99) - R1 (00-01) - R1 (02-03) - R1 (04-05) - R6 (98-99) - R6 (00-02) - R6 (03-04) - R6 (05-06)