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mtnthundr2 Take a look at Boyd's they have a lot of replacement stocks for old guns. I found what I think is your stock but, without having the gun in front of me I can't tell for sure. Call 'em.

Western Field was the brand that Montgomery Ward sold shotguns under there were two manufacturers of the model 560 Mossberg and Noble. I doubt the Mossberg parts will interchange with the Noble made guns. What is the reason for needing a replacement stock? If it is cosmetic you could possibly repair it or if your woodworking skills aren't up to it maybe a stockmaker could restore it. Good luck in your quest.

eta: Look at what Boyd's Gunstocks has to offer they have replacement stocks for the Western Field shotguns.