1968-1989 C3 C4 GM 3916170 dash Headlight switch BARREL NUT Used OEM

 Quoting Corvette Central-

" 3/4-inch long threaded barrel nut that mounts the headlamp switch to the dash. This nut also includes the plastic insert that guides the headlight knob rod  - some reproductions do not include this"

Ours is  the NCRS-correct original  :)