I tried to upload a PDF copy of the axius install manuall that came with my boat. Page 159 has the diagram you are looking for with dimensions. the whole PDF is 26MB - too large for this website. i found the PDF copy by google searching one day. One of the merc european websites has them all. Here is the title + part number of the manual: AXIUS & AXIUS SEACORE—496 MAG & 496 MAG H.O. WITH EMISSIONS CONTROL INSTALLATION MANUAL 90-899883345 AUGUST 2008 If you still cant find it, Ill try to upload the 26MB file to somewhere for you to download, but it is out there - which is how I found it.