Nikon lenses + Mattebox? Stepping rings?

I'm looking at getting the M2. I have my HVX and a Chroziel Mattebox with a ring that connects the camera (82mm) to the mattebox (104mm) What exacly do I need to connect my mattebox to nikon lenses? I'm a bit lost.
 
What is the front diameter of the Nikon lens? It should have a diameter located on the inside of the front of the lens, with a greek symbol of an o with a slash across. Then I can get you the step down ring needed from Chrosziel. Don't forget that you still have to mount the mattebox to the 15mm support, because it would be too much torque weight to have the mattebox sitting on 2 rings then the lens then the M2.
 
"What is the front diameter of the Nikon lens?"

Rush,

Nikkor 24mm f/2.0 AIS is 52mm
Nikkor 28mm f/2.8 AIS is 52mm
Nikkor 35mm f/1.4 AIS is 52mm
Nikkor 35mm f/2.0 AIS is 52mm
Nikkor 50mm f/1.2 AIS is 52mm
Nikkor 50mm f/1.4 AIS is 52mm
Nikkor 50mm f/1.8 AIS is 52mm
Nikkor 85mm f/1.4 AIS is 72mm

Thank you in advance!
 
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