Whining Noise

Guys, I have searched high and low for the name of a part. I've had to resort to creating an account to see if someone could help. I've been to Auto Zone, and all others similar. Auto Zone sold me an Idler Pulley, this is not the right part as it is slick and I need a pulley that has belt grooves. I have a 2009 Acura TSX, I know where the noise is coming from and what needs to be replaced, but can not locate the name of the part anywhere. The closest match I have found is, Accesory Belt Idler Pulley. The pulley I need to replace is the top one, here are a few pics I have. On the chart pic, it is #7.





thanks