Haven'y got the book to hand, but I think you mean the hexagonal plate visible on top in your photo?
If so, the holes are central around the 5" tube, and you make one the reverse of the other. The right hole topmost on one, left topmost on the other.
From looking atmy calpiers, I believe the best way for the bleed valve and handbrake cable is for the topmost hole to be the one that is closer to the front. i.e left hand upright has left hole topmost.
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