Actually looking back over my couple of pictures, the center point i have marked looks around right? from memory there was over 20mm (cant remember exactly) what it was.
So using my pic with the ruler on it. i just need to drop the top left corner (RS15) down 3mm. and mount the bracket using the measurments you said. and then i have the near side done? Then just mirror / hand it to the other side?
Sorry. Making this more complicated than needed now
