Hiflofiltro air filters are manufactured to fit the factory air box and are a direct replacement for original equipment filters.
Fits:
Yamaha XJ400 (Japan) (4G0) — Japan ,
Yamaha XJ550 (4V8) 1981 to 1985,
Yamaha YX600 C-S,T,U,W,A Radian 1986 to 1990