Original Yamaha part, partnumber 5x6-22147-01. Fits models (please check your partsbook):
1983 Yamaha TT 600
1984 Yamaha TT 600
1985 Yamaha TT 600
1986 Yamaha TT 600
1983 Yamaha YZ250K
1984 Yamaha YZ250L
1983 Yamaha YZ490K
1984 Yamaha YZ 125
1984 Yamaha IT 490