Here is a PDF of the drawing for this. I also left about an 1/8″ gap at the top of the bracket to allow for clearance when I swing the bracket out of the way. I used a piece of the 1/8″ hardboard to get that spacing consistent on both sides. The template board is that 369mm length shown in the drawing. I find mm more accurate to use when the numbers do not come out to a 1/16″ increment.