Processing customization is the purpose of air filter installation adapter size installation size 51.5mm (mm) model FCR28/33/35 mm CNC air filter installation adapter 021-211 applicable model 021-211 article number SCL-2022120040 specification FCR connector 021-211 silver color is suitable Model CBR600F FZR400 YZF600 Product name: FCR28/33/35 air filter installation adapter 021-211 silver installation Model: FCR28/33/35 Weight: 80g Color: Silver Size: C2C spacing: 51.5mm, Intake inner diameter: 34.5mm, Height: 29mm, Filter Mount: 52mm-56mm Oval (54.5mm) This fits (generally): 28-33mm. Keihin FCR Carburetor This fits (specifically): Honda CBR600F Hurricane (1987-1990) Honda CBR600F2 Hurricane (1991-1994) Honda CBR600F2 Hurricane (1991-1994) Yamaha FZR400 (1988-1989) Yamaha FZR600 (198 9-1996) Yamaha YZF600 (1989-1995) Other Model 55mm Airbox Mouting