The board size doesn't change, only the hole (shutter size) in the board. Look at your lenses - is the shutter marked "Copal 1," "Copal 0" or just "Copal"? If all else fails, measure the hole size after removing the lens/shutter from the board and compare it against standard Copal shutter hole sizes, i.e. 0 = 34.6mm, 1 = 41.6mm, 3 = 65mm
You will also need a lens spanner wrench, which are available from all sorts of places.
Unscrew the rear lens element first, then use the spanner wrench to remove the retaining ring.
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