Drew,
A generic as Bill says, switch,or a Marine Grade switch will work.
Not as fat around or short as a sixtys stock GM unit.
Has ACC OFF ON START positions.
A Marine switch is Brass bodied and threaded for the entire length of the snout.
Means You can mount it virtually flush with the face of the Dash.
That puts the fat bodied part almost even with the rear of the bottom dash flange.
regards,
steve sr.
