Dear Ole,
don't hurry please - I have decided to keep the lens
Please, please, let me know if you find the board - even if it's not 00 but 0 size
If Ole, or anyone, gets you a board that isn't size 00, it isn't too hard to mount a 00 sized shutter in a 0 or even 1 sized board for a Century. This is because the aluminium boards are so thin - this technique wouldn't work with thicker lenboards.
All you need to do is get some thin aluminium sheet and cut it to a square that's a little smaller than the throat of the camera. Then drill this, centraly, for the 00 shutter, deburr it and paint one side the mattest black you can. Put this in the back of the lensboard, inside the recess. The 00 shutter will go in front of the board, and the lock nut pulls this flat plate up against the back of it: keep it square to the board so it leaves an even gap between the square plate and the inside of the lip on the lensboard. This works because the back of the 00 shutter doesn't have moving parts that would be jammed against the board by doing it this way.
If you just want to try out your lens, you can even make this technique work if you use thin but really stiff card to make the plate for the inside of a size 0 lensboard. I haven't tried plastic, but if it is easier to obtain than aluminium sheet you could probably use some stiff but thin plastic sheet.
In fact I have pieces of card like that inside the boards for a number of the lenses I use on my Century, even on 'right-size' boards: they are easy to change and when the 'mattness' of the paint on them declines due to fingerprints or whatever I can just swap one in instead of having to repaint the back of the lensboard.
Peter