I agree with Kevin. Three out of four of the holes line up so I am assuming that the fourth hole of the cab is in the correct place, but the hole in that sweet frame may be a hair off. I have seen this custom frame in person. It is a work of beauty. I would not touch the powder coated frame to enlarge the hole in it. I wouldn't be able to sleep at night second guessing myself for not just grinding a little bit of sheet metal on a floor which is going to be epoxy primed and painted anyway.
