I believe it'* a T45, but check the change supercharger belt write up, it says what size it is to be sure.

You know, I wanna say it was a T-45 torx, but I'd have to look again.
I used a 3/8" drive socketed torx because of the location, but some else may work for you.

What??? Is it synchronized posting day???
I musta missed the memo.......

Does anyone recommend using Anti-seize or a Loctite compound for the install?

As the pulley spins it will keep it tight. No need for lock tite

Thanks again Dan.

OK, I have the pulley and the T-45. I tried to loosen the star mount but it is tight both ways. Before I go too heavy, can you tell me if it is righty tighty/lefty loosy, or is it the opposite for this pulley bolt/star mount thing?

thanks

nvm - i figured it out. it was opposite. My time to edit was passed so i couldn't delete the previous post.

Just remember, the direction the pulley spins will tighten the bolt.