Since there are several "wrong" answers to this if you search the internet, the Supercharger idler pulley bolt on my 2003 is in fact REVERSE THREAD. Don't know if some years are different or what, but I can confirm the direction on my model year. I used a 47 torx, though I bet a size 50 is perfect.

Replaced with a Gates pulley from OReilly and it took 5 minutes.. Old pulley didn't have lots of play but it sure rattled when you spun it. So after 95K miles- its chunked.

FYI

Maybe not "wrong" answers, but, I think there are some years that are reverse thread. Or maybe its just people are thinking of a different bolt. Who knows.