A/T plug leaking fluid - what is it called?

[jared]

I lost a bolt,plug something. The car leaked out the AUTOMATIC tranny fluid through the bolt hole. It is about a 17mm shank bolt. It is not on the pan, but behind the pan in a rectanglular peice, not sure what its called? I went to the dealer but cannot locate what the bolt is called.

Any help will be appreciated

 

[jared]

These are some ictures I took underneat the car. It leaked out all transmission fluid. these pictures are looking to the rear of the car. The plug is to the rear of the automatic transmission pan.