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I would also take "1903 05 08" as indication of a stock which fits either or all of those models (notice no M1910) though, if memory serves, I believe Kuduae has indicated in prior posts that there are minor differences between stocks of those models in the magazine area (width).

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Yes, a M1903 stock fits a M1905 barreled action too, as you see here:

I haven’t tried a M1908 action, but I think it will fit too. The M1910 has a wider magazine.