Measurements from Nauticam or Sea & Sea Macro Ports

Hi,
trying to house my Nikon Micro 85mm,
i am looking for a as short as possible port to be able to use macro wetlenses as well.....
Housing is a Hugyfot, and they dont have a narrow macro port.
So i would addapt a Nauticam or Sea & Sea.
Now i have to find out which port is the right.....

The Nauticam ports are very nice with the 67mm thread, and it looks like i can get a lot of different sizes ( every 10mm ).
But how long is a 18701 Macro Port 60 inside?
Would need the lenght from the inner glas side to the absolute end, and or the border to the housing.
And if possible in metric system ;-))

Then i can look which port will be the shortest possible for the combination with the adapter ring.

Thanks a lot,
Wolfgang