What are the dimensions of 122 film?

I'm trying to figure something out here and Google and Wikipedia are no help. Does anyone know what the width of 122 film is? I can easily find the exposure size, but not the size of the film itself. My guess going by exposure size is it is 85mm, with the backing paper being maybe 1 mm wider. Can anyone confirm?

Thank you.

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Spool length will get you close but is slightly larger than the film.