I would like some contact info about an idea I have for a DLC

I'm afraid this forum is about as good as you're going to get, my friend.

Chances are... all of the DLC(s) are either complete or on their way to completion.

They have a website for reporting bugs and suggestions just Google it.

They're not going to read your ideas.

The forums are a good place for community managers to get a general feel for what we'd be interested, and they can relay that back to the development team.

But specific ideas for content are things the devs are actually legally prohibited from looking at.

As others have said you can offer suggestion here, as many others have but that is about it.