This is the chrome pull knob on the hub of most all GM 67-70  steering colomns with hazard warning nights. -  exactly as per illustration.

Note this is a longer knob.. there is also a shorter version.

Black plastic ones were used on 71 and newer cars.

Fits: 

• 1967-1970 Chevrolet Camaro
• 1967-1970 Chevrolet Impala
• 1967-1970 Chevrolet Bel Air
• 1967-1970 Chevrolet Biscayne
• 1967-1970 Chevrolet Caprice
• 1967-1967 Chevrolet Chevy II
• 1967-1970 Chevrolet Nova
• 1967-1970 Pontiac Firebird