New LS1 Owners - Newbie Tech - What can I put in these holes?

I've got two large allen screw filling some holes and I would be interested in knowing what I can put in those. The engine is a C6 ls2. One of these scews in the block off for the oil cooler lines:
http://i1188.photobucket.com/albums/z404/bsmiddleton/hole3.jpg

The other one is located just above those lines near the oil filter. The engine is upside down btw:
http://i1188.photobucket.com/albums/z404/bsmiddleton/hole2.jpg

Sorry for the cell phone pics.
thanks
Scott

That's what she said.

Hahaha, I thought long and hard about that title.

Hahaha, I thought long and hard about that title.

lol...

I assume you're talking about some kind of plugs to make it look pretty?
I got some here to fill my engine bay holes after hiding my wires:

http://www.widgetco.com/

Had good luck with their products.

I'm actually wondering if I can put something else in there like a oil pressure sensor or if it is for something else. It has to be a provision for something. Right now the plan is to put a T over the oil cooler ports and do my oil pressure from there. It would be cool to continue to use the oil cooler lines though and do the pressure from somewhere else.