I have a 12in commercial ektar that I would like to put into a shutter. I understand that these lenses (if sold with a shutter) originally came with Ilex #4 Acme Synchro shutters. My question is, will an Ilex #4 Universal fit and work properly? What's the difference between them? Also, will other shutters fit, for instance an Alphax #4? Are there any modern shutters that would work? I've using this lens in barrel with some nice results, but I'd really like to get the extra flexibility of a shutter. Any other ideas? My camera is a Graphic View II. Thanks!