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Be sure to specify 12 or 20 gauge. The stock sets are different as I'm led to believe. On a similar note, I understand that the 20ga 870 furniture fits the 7400/7600 rifles as well.
"Furniture" as it applies to firearms means the metal bits and pieces, such as forend iron, barrel straps, escutcheons, and so on. Typically, the furniture is brass or steel.
The stocks you're asking about can be had at reasonable prices from Western Gun Parts right here in Edmonton. Do yourself a favor and take the gun with you when you go there. Leave the gun in the truck when you get there and go in and explain what you're looking for. You'll probably be given choices - new, used, finished, unfinished - that sort of thing. At that point, tell them you brought the gun (if they haven't already asked) and offer to bring it in. They'll help you choose the right one/set for minimal fitting.