it is the bolts that holds the bell housing to the transmission. i had bought a tranny from the junkyard and while i was putting it together i found that one of the holes was stripped. there is enough room to drill and helicoil it which is what I'm planning on doing i just don't know what thread the bolt is. i added a picture of the bolt so you can see it and know exactly which one I'm talking about, even though its the same bolt in every hole.

That should be an M12-1.5, but your best bet is to simply go to a good hardware shop (find a Granger, or Fastenal if you have one near you), and have them check it with the gauge. If you don't have a place like that near you, go to a Home Depot or Lowes. They always have the thread matching tool there. If you're in a pinch and need one right away, get a bolt there, but don't use this permanently. They're not going to have the proper type of bolt (strength grade and proper anti-corrosion treatment).

If you can't get the right bolt locally, just order one through a dealer or Napa auto parts. If you have to order it, you might as well get the right one.

auto store have a lot of metric bolts and some have size checkers too.