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(Length [centerline] X Height [butt-plate] X Width [receiver to butt-plate] in inches.)10" x 5" x 1"- 1.5" roughly; Measurements taken from my DSA X-Series Butt-stock (which is about as close as you can get for a new production "Humback" FAL butt-stock). That's ballpark; make-up the rest.
"...Anyone?..." The butt stock and you're looking for the dimensions of where the stock fits onto the receiver, right? You have a rifle? Which one you have matters a bit, but measure the rifle side.