Quote Originally Posted by bart Nadeau
I'm not sure my description is clear enough to make sense but does this sound like any 13 x 18 holder you have heard of?
It does - "sound like any 13x18 holder I've ever heard about".

But I don't have any of them - the only single-plate 13x18 holder I have is a Linhof one which is different. I can't find any of them through a quick search through "the usual suspects" either, more's the pity...