These Decals/Stickers were used on various Yamaha, Honda, Kawasaki, & Suzuki Models in the late 1970's-1980's. These were used on the models with aluminum DID rims. The sizes are 1.60 X 21 & 2.15 X 18.
 
1977-1979 Yamaha DT250D/E/F
1977-1978 Yamaha DT400D/E
1976-1981 Yamaha XT500C/D/E/F/G/H
1976-1979 Yamaha TT500C/D/E/F
Yamaha YZ/IT models
Kawasaki KT250
Honda XL500S 
Honda CB250/CB250S
Please do your own research to confirm all the models it fits, that used the DID rims.