Quote Originally Posted by Ole
Chris, 13x18cm bookstyle holders are very common in Europe. Unfortunately they come in about 100 different external sizes, only one of which will fit any given camera. I was fortunate enough to get a 13x18 plate camera with four matching holders. Three of the holders can take 5x7" film inserts, in the fourth one they will slip. Apart from that I can find no difference between them, even all internal measurements are the same!
Ole, you are right, on second look, my TP appears to be a 13x18 model. Well, these things might be common in Europe, but certainly not in Canada. Guess I have to scour fleabay a bit more intensively.

Cheers,
Chris