Ian, do you have the information to know if the 9x12 and 10x15 Bergheils used the same shutter sizes, and/or what those sizes were? It shouldn't be too hard to find some of those lenses, especially the Skopar, in shutter at a decent price, but it might be kind of a crapshoot to try to get a shutter that fits the bayonet without an adapter.

-NT