OK, I have been looking all over the net and can find outside measurements and measurements for the lights themselves, but I can't find the measurements for the hole itself. I am going to get someone to make me a light assembly for my trailer and I don't want to guess on the holes because they will either be too small and I will have to grind on them or worse yet too large. I want to use the rubber grommet mounts on 6,5 oval lights. Everyone selling lights says they fit OEM, but no one tells me what size hole is OEM. Here is a picture of a mount for one light. Can anyone point me to a drawing that includes the hole dimensions?