The 1922 Wollensak catalog here: http://www.cameraeccentric.com/info.html shows lens inner flange diameters, which may give you some idea of how it will fit your board. There may be more information in other Wollensak catalogs on cameraeccentric; I didn't look at many of them. I have no idea on the size of the 5X7 Rittreck lens board.
Len
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