This is a heater knob that is maroon in color and imprinted with the word "Warmer" and has the directional arrow. For 1947 1948 1949 1950 1951 1952 1953 Chevrolet Trucks

This is a heater knob that is black in color and imprinted with the word "Warmer" and has the directional arrow. For 1954 Chevrolet Trucks

Here's a maroon cowl or top vent knob for your 47-53. For 1947 1948 1949 1950 1951 1952 1953 Chevrolet Trucks

Here's a brown cowl vent knob like original for your 40-46. For 1940 1941 1942 1944 1945 1946 Chevrolet Trucks

Here's a black cowl vent knob for your 50-53. For 1954 Chevrolet Trucks

This is an Ivory colored accessory cowl vet knob. For 1940 1941 1942 1944 1945 1946 Chevrolet Trucks