If you figure the location and angle carefully, drill a 2" hole in the footbox (holesaw in fiberglass) from the inside at the lower bolt's location. The last pipe (on my ERA) moves forward (not down covering the bolt) and you can get socket and extension in there working from inside the car.
Make a 2 1/2 aluminum cover plate and dab a bit of silicone to cover the hole when done.
Been there-did that.
