I’ve never heard of the Photox, but I suspect a Copal #1 will work, looking at pictures. You may need to orient the shutter on the lens board carefully so none of the parts of the shutter that stick out interfere camera controls. I have a Linhof baby Technika that came with a Xenotar 100mm f2.8, and it fits but barely, and it needs to be turned so the certain parts don’t interfere.
I’m surprised a Nikkor 105mm is in a #1 shutter. Which 105 is it? I have a 105mm M which is in a #0, and the 105mm W came in a #0 as well.