Rear Frame Grill Hole Sizes?

[robd]

I'm looking for a favour, I need the dimensions of the rear frame grill holes and their distance from the centre line of the frame. My Italian GP has been repaired and that part came from an Indian donor which doesn't have the holes and so need to drill them before painting it. I've found the following pic of the area (though it's an SX in the pic). Cheers,Rob