Thanks for taking the time to read. I have a '69 GTO with A/C. My question is: does anyone know how to locate the heater box stud that is behind the passenger side inner wheel well? The service manual says to drill a 1" hole in the fender well, but not how to locate where to drill. Second, not related to the heater core. Does anyone have a routing diagram for the washer hose to pump, or an explanation?