There is no difference in quality e. g. tolerances between Lisco, Fidelity and other modern holders. But some old wooden holders don't meet the specifications.
As I know Linhof double-holders, for plates and sheet-films, weren't aviable in 5x7" but only 13x18cm, 4x5", 9x12cm, 6,5x9cm, and 2 1/4 x 3 1/4".
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