Battery hold down bolt.  One or two used per car.  Sold individually. 

1961-63 F-85

1966-67 Cutlass and 442,

1962 Oldsmobile 88, 98 and Starfire

1964-75 Oldsmobile 88, 98, and Starfire

1961-64 Buick Special and Skylark

1965 Buick Special, Skylark (except H.D. Battery), LeSabre, Wildcat, Electra

1966 Buick all models except those with H.D. Battery

1967 Buick models except Grand Sport

1968-70 Buick Riviera

1966-67 Pontiac Catalina, Bonneville, and Executive

Black plastic cap covers hot wire.  Most cars used red caps (also available) while other had black.  Check your car for proper color.  Mandatory for detailed restorations.

1961-77 Buick A-Body

1961-77 Oldsmobile A-Body