clutch switch

I am near completion of my 1970 340 4 speed restoration.
I am replacing the clutch switch that grounds the starter relay.
Can some one please provide a photo of where that wire goes through the fire wall.
The wiring diagrams shows it going through the fire wall not at any of the bulkhead plugs.
I don't see any holes larger than 1/4" in the fire wall & the diagram shows a grommet.