Everything was hand-fit in those days, and manufacturing processes were less than cnc consistency, so...
finding a butt plate will require patience at least. Ebay searching for sure, maybe inquire with the Savage collectors at 24hr'fire. I'm assuming this is a carbine butt plate that wraps over the top 1/2" +/- (?), there is also an earlier version that has a narrower tab that extends another 1" along the top of the stock.
Maybe include a photo of yuor stock would be a helpful guide to which plate you need.
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