I need 20ga M2 parts!

[Tech]

I know that this is a long shot, but would anyone have a 20ga M2 factory magazine cap and factory magazine spring? I got a steal on a used 20gaM2. It came as just the gun, no box chokes, or any of the spare parts. (Who doesn't save that stuff anyway?) It is set up for 3gun already, with a Nordic extension. I want to use this gun to duck hunt. It might be hard to convince the game warden the tube that sticks past the end of the barrel is plugged and only holds 2 shells!
I have the part numbers from benelli, and they said order from Brownells. Brownells says minimum 5-8 weeks.