Chamonix says the minimum bellows draw on your camera is 52mm.http://www.chamonixviewcamera.com/45.html
So bellows draw won't prevent you from using a 75mm lens. However, without a bag bellows and/or a recessed lens board your ability to use movements may be restricted more than you like. I'd suggest buying the lens and seeing for yourself how much your movements are restricted. Then if you think you need a bag bellows or a recessed lens board you can get one.
The actual focal length of virtually all lenses varies slightly from the stated focal length. Manufacturers usually round numbers off. So any 75mm lens you buy might really be 74.6 or 75.8 or whatever. But I've never found or heard of that being a practical problem for anyone.
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