I have seen video's galore, on how to replace this tension pulley on every vehicle but the 2007 Monte Carlo SS. Has anyone replaced one on a 2007 SS?

 

I didn't replace tensioner, but I had to remove the tensioner spring to replace the belt.
You will see the spring when you remove the front passenger side wheel.
So, that's where you remove the tensioner.

Yes its tight in there, they stuffed an 8 in the room made for a 6.

P.S. there is a video on it, might be for a 06 Impala SS, same motor, same tensioner.