Extra bolt after head gasket job?

What is your question?

I just did a headgasket job on my 2000 subaru outback. The problem im having is i have one bilt that seems to look like a bellhousing bolt but its not cause my motor and tranny are bolted back together and i have no empty holes where it could go. I have checked the power stearing and air conditioner aswell as the alternator cant not seem to figure out where it goes. Wondering if anyone has an idea what im missing possibly? Thank you