I have these front and rear cells of a Symmar 1:5,6/360. They are in a very decent condition, not pristine but absolutely usable. But the shutter is missing. Is it possible to find one with the matching threads and correct inter cells distance? I am not familiar with lens x shutter combinations but I remember reading some posts in this forum that gave me the impression that shutters were sort of standardized and lens makers designed their cells to fit available shutters. Click image for larger version. 

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