I just need the cap that closes it... I've misplaced mine. If you've got one layin around that you dont need, I'll take it

 

I have one with the wingnuts. LMK. 3" by the way.

 

You can use an exhaust flange and have a muffler shop weld a plate in the middle. I lost mine and used the flange that came with the cutout (I welded mine instead of bolting on). I think it cost me nearly $5 to have it welded.

Zach