Got a '98 V6 with A/C, and the belt tensioner is "frozen".
The attachment screw seems to have a Torx head (bifocal vision isn't perfect these days).
Can anybody spec the size so I can buy the correct size the first time?
Thx in advance.

 

I believe it is a T-45 or T-47. I did this about a month ago and bought a T-45 and it may have been a little loose but it was close enough that it worked. I would have bought both but they were out of the T-47 so it forced my hand.

 

If you have a quality T45, it should work fine.

I've replaced my pulleys 2 years ago.