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On either side of my radiator support I have a square hole about 3/4 inch wide and 3/4 inch tall. Is this the same hole as listed on the assembly manual? Per the assembly manual for the body page N8-8105-1, it calls for a plug button 376966-s listed as item AD. That's a round plug for a square hole. Doesn't make sense but is that correct? Also the assembly manual just refers to a hole on the left side. I have a similar hole on the right side too.
It is needed on the driver side to keep water from possibly negatively effecting the regulator. Not really needed and I haven't always seen the passenger side hole plugged.
Metuchen cars have 4 square holes. Rubber plugs typically go in top holes only
The odd looking opening is actually not typically a perfect square hole . It started off in earlier 67 as a oblong hole and then transitioned in later 67 production to have a square punched added to the oblong so what you see is both. It is unused on a Mustang but has to do with the mounting of the headlight assembly on a Cougar which shares the same radiator support.
Can you tell me anything about the size of the hole next to the alternator regulator and whether a Metuchen car uses the T- clip instead of the strap per the assembly manual to secure the wiring harness? Also what size is the hole? Mine measures about .28 inches which is too large to hold the normal straps.
The assembly line wiring harness has the taped in locating plug that goes in that hole. The other holes for the tapped in loop style connectors are .25.