I installed a Perrin Lightened Crank Pulley in my 08 wrx and couldn't get the A/C pulley back on. I called the parts department at my dealership and they said that 2008 was the first year that Subaru removed the tensionor pulley from the A/C belt. They told me that the only way to remove the A/C belt was to cut it off. And in order to install a new one you had to buy a new belt and use a special Subaru tool to install it.

Does anyone have any ideas about how to re-install my old belt?

My engine block still has the mounts for the tensionor pulley,
Does anyone have any ideas about installing a 2007 (or any EJ25) tenionor pulley set?