Need a measurement

Hope one of you guys are closer to your boat than me and could help. I need a measurement from the bottom of the hull to the hole that goes through to the head area/ at the back of the V berth(original tank area) . I am trying to order a tank for the v berth area and i need to know how high from the bottom I need to have the fitting installed. I can't get out to Petrel before the weekend, and would like to get it ordered. Might be impossible if you have tankage already, but I might get lucky, I hope.

Thanks!!