crankcase fiberglass used to replace the original air filter housing in the event of use of individual air filters. Exterior finish in black gelcoat to use body or painted Matt Black (Optional).R100/100S 76-80, R100CS/R100 80-84, R45/R65 78-85, R65LS 81-85, R80RT/R100RT/R100RS 76-84. Mounts only on the models with cable carburetor cable pull on the handlebar. Can not be mounted on models with carburettor air on the airbox box