71 mustang firewall speedometer opening ?

[Hoagie Ranch]

Does anyone know what opening in my firewall the speedometer cable goes through. Can't seem to find a 71-73 Mustang firewall diagram on line. I have attached photos of my firewall . I have it narrowed it down to 2 holes , maybe the one close to the power booster or the hole farther left of power booster seems to be better location . The cable fits through both holes. I have seen other nice firewall diagrams on the vintage mustang forum but only for the older stangs.

 

[Billw69]

The hole behind the brake booster is where mine goes. I think it’s the normal location.

 

[Doug's 73 Mach1]

Mine too comes through the hole behind and above the brake booster, pretty much a straight shot from the back of the speedo.