Not the best pictures but better than nothing.
First picture. When looking on the inside of the tunnel at the bottom of it you can see a hump, place a flat edge across it. Measure 120mm up.
Second picture. From the firewall back to the hole is 300mm.
This is a real pick of a thing to measure.
If my carpet was out of the car I could have taken some better pictures from the in side.
Hope this helps.
Victor