Just took delivery of a backpacker's dream - 9x12 Patent Etui. However, the filmholders that came with it won't fit. Two of them bear the KODAK name and the other is a no name. They appear to have identical dimensions to the Zeiss 665/7 and to several Certo holders which I also own. Indeed, the new holders fit perfectly into my 9x12 Certotrop. Meanwhile I'm dead in the water with the Patent Etui. What kind of holders am I looking for and where's the bestplace to look?