That's just 2am speculation while I await measurements of the Stanley plate and holder.
7am speculation is that the difference is slight and the holder mount itself is exactly 3 1/4 x 5 1/4, since from another post your Kodak sheaths are undersized. I've sent 1/4" plates out before with no issues, so there was apparently variation in plate holders in this size as well. I should be able to trim a little bit off each plate to ensure fit, at least.
Steven is right about getting actual working info!
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