96 Cougar 3.8L - drivebelt tensioner assy - Torx bolt?

Hi
My 96 Cougar 3.8L needs the Drivebelt Tensioner Assembly replaced.  The
Torx 
bolt is larger than a T-50.  Anyone know what size Torx bit is needed for 
this bolt?

I've seen one comment that this is a LH thread bolt, and others say it's
RH 
threaded (which is what I'd expect).  Anyone know which it is?

Also, any tricks to removing this bolt?

Thanks,
-Lance