I'm doing a rotisserie resto on my Mach and trying to correct some of the mess done to the undercarriage. Was hoping someone could confirm on this, but pictured are four holes, three of which I'm thinking are not factory. I believe the bottom hole, or the most outer hole is for the differential vent hose attachment bolt. Can anyone confirm that the remaining three holes are not correct? If they are correct, what would have been attached there? The car was originally a single exhaust car and years ago (early 80's) I paid to have dual exhaust put on it. They weren't very professional and really half "A'd" a bunch of stuff, putting hangers in really bad places. You can see too were they also hacked into the brake line support bracket with a torch and used it to support their exhaust....jeez!!!