This is exactly the design of my holders for a Curt Bentzin 13x18 reisekamera. As Ole said, there is some variation in the dimensions - more specifically:-
The tiny slot which is the locking system, half way down the top edge, varies a little.
The exact configuration and thickness of the end metal catches varies a little, too.
The indent in the mahogany edges is model specific, but there is is never more than 1-2mm difference.
In other word it is worth getting look-a-likes and whittle the mahogany on the indent and replace the metal wings until they fit. I have doubled up on my useable double holders from 3 to 6.
The design allows (or can easily be modified to) receive and lock down 5x7 film sheaths.
There is a budget FED 13x18 camera listed at the moment (without plate holders) and the back system (and therefore the missing plate holders) look to be exactly right for the type you illustrated.
Tony - there is something radically wrong with your measurements!
I have two different types of these made for 13x18cm plates.
The thickness of both is 18mm (there can't be room for a double holder in 6mm!).
My two have identical width, 154mm. Lengths vary a few mm but the shortest is 215mm.
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