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A quick google gives the following distances between action screws if you want to check whether to get the staggered or centre feed. Numbers from some US forum:

4.275" Staggered feed short action...

You order one from here and wait a couple of weeks... Boyds:

They have different versions for centrefeed and staggered feed blind mag, so worth checking which yours is too. The also give...

I think anything for Savage Mod.10 family should fit. Just make sure you're getting the short action version (ie for Mod.10 not 110).

Are the Stevens blind mag, floorplate or drop box? Pay to make...