Here are a couple of addenda, without pictures yet.
Voigtlaender 9x12 holders (no identifying number; I suspect all Voigtlaenders are the same): width 97 mm, length 147 mm, locating lip 7 mm (measured at the edge of the holder). I can personally confirm that these fit a Voigtlaender Bergheil and Avus, a Nagel Fornidar 30, and a Photo-Porst house-brand camera that I think was made by Orionwerk.
Kodak 9x12 film/plate holder (no model number; they say "Patent U.S.A. 1,933,823"): width 97 mm, length 148 mm, locating lip 6 mm (at edge). Double flange with the groove in between (I'll post a picture); they fit the same cameras as above.
My (Currently only) Voigtländer holder marked "Voigtländer" is 151mm long and 101mm wide. Some more holders arrived today but thanks to this thread I identified them as Linhof holders, 141X101mm. Hmm So it seems I have 1 working holder and 4 extra sheaths. Talk about making every shot count
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