Stevens 77D shotgun - Just got one and have a few questions!

Greetings! I just squired a new to me Stevens 77D shotgun. I got it for an unbelievable price, but have a few concerns. Well mostly one, my stock doesn't appear to fit on the receiver correctly. There is about 1/3-1/2'' gap at the top of the stock to the top of the receiver. I feel it may be a stock from a different model. I'll get a picture up by tomorrow morning, I hope. They guy I bought it from said he fired and it was fine with the stock that was on it. My question is, is where can I find a stock for this shotgun? I know Numrich used to sell a 77E stock, but NO ONE I can find has one in stock, anywhere. Does anyone have one laying around they could sell me or point in the direction of one? Thanks so much guys!

Edited for pictures:
http://i.imgur.com/PVlCPns.jpg

http://i.imgur.com/4mgckHI.jpg

http://i.imgur.com/T5mCCLT.jpg