Benelli Stock part 2!

[cgseanp1]

So I got the stock off my Benelli M2. Just had to remove the nut.. durr.. anyways, I went to install the comfortech stock, but I think I am missing a part or 2. Can someone tell me what parts are needed to install the comfortech stock? The only thing I have is the stock itself and there is some plastic doohicky thing on the inside. The plastic piece on the inside has a hole, but it's too big so the nut on the bolt just falls right through.

Also, I noticed the stock doesn't fit tight against the receiver of the shotgun. Is there supposed to be some kind of gasket or something there?

Any help greatly appreciated!!
Thanks

[cgseanp1]

I figured it out, I am missing 3 small parts. I Hope I can order them from benelli.

[swifty]

Are they inside your old stock?