Cap has "A/C" and "OIL" in raised letters on top and can easily be painted to the color of your choice.  Correct steel wool mesh inserted to filter debris.  Used on all models equipped with valve rocker cover without ventilation slots.  For all of the following models that vent through cap(s).  Some cars take more than one.  Caps sold individually

1939-67 Buick models with vented oil cap(s) on valve covers

1964-65 Oldsmobile V6 engine (except closed pos. vent)

1966-67 Oldsmobile inline 6 engine (except air injector reactor)

1937-48 Chevrolet models (except forward control chassis and cab over engine)

1955-62 Chevrolet 2nd series 6 cylinder models (except 261 c.i. and forward control chassis)

1961-62 Chevrolet series 10

1964-66 Chevrolet models (except forward control chassis, 8 cylinder, closed vent, heavy duty, and air injector reactor)

1967 Chevrolet all 6 cylinder passenger models (except those with closed vent)

1967 Chevrolet 6 cylinder G10-20 models

1967 Chevrolet 6 cylinder 10 through 30 series (except those with forward control chassis, closed pos. vent, heavy duty, and air injector reactor)

Chrome cap has "A/C" and "OIL" in raised letters on top.  Correct steel wool mesh inserted to filter debris.  Used on all models equipped with valve rocker cover without ventilation slots.  For all of the following models that vent through cap(s).  Some cars take more than one.  Caps sold individually

1939-67 Buick models using vented oil cap(s) on valve covers

1964-65 Oldsmobile V6 engine (except closed pos. vent)

1966-67 Oldsmobile inline 6 engine (except air injector reactor)

1937-48 Chevrolet models (except forward control chassis and cab over engine)

1955-62 Chevrolet 2nd series 6 cylinder models (except 261 c.i. and forward control chassis)

1961-62 Chevrolet series 10

1964-66 Chevrolet models (except forward control chassis, 8 cylinder, closed vent, heavy duty, and air injector reactor)

1967 Chevrolet all 6 cylinder passenger models (except those with closed vent)

1967 Chevrolet 6 cylinder G10-20 models

1967 Chevrolet 6 cylinder 10 through 30 series (except those with forward control chassis, closed pos. vent, heavy duty, and air injector reactor)