belt tensioner on 97 Mustang

I'm trying to change the serpentine belt tensioner(the whole assembly) on my daughters 3.8L 1997 Mustang and was wondering if anyone knows if that is a left handed bolt. I know the pulley on there has a left hand bolt. I tried to loosen it the way a normal bolt would come out and it creaked a couple of times , then stopped, thenI tried it the other way, no go. Any help would be greatly appreciated before I snap the bolt off. By the way, it takes a torx 55, another tool to buy.

The tensioner doesn't have a square hole for a 1/2" or 3/8" ratchet? If i remember correctly it should.

Taking the belt off is no problem, i'm trying to remove the whole tensioner, it's gone weak, belt is slipping. There is one bolt holding it on that takes a Torx 55 and I tried turning it counter-clockwise and it creaked a couple of times, then got harder. I know the pulley bolt loosens clockwise, was wondering if the bolt holding the whole contraption in there also turns clockwise to get it out of there. Just trying to avoid a stupid costly mistake. If anyone knows, please chime in. Thanks!

The bolt has regular threads, tore out most of the threads getting it outta there. Don't know why it was so hard, but I had to fight it all the way. Good to go now, thanks carlos80.