I recently picked up a wooden 5 x 7 plate holder and was surprised to see that it doesn't fit my 5 x 7 film back. The plate holder is double sided and is wider than the 5 x 7 backs that I have. Does anybody know what type of back I need to use the plate holder. Its about 3/4 inch wider than a standard 5 x 7 film holder. Thanks
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