yeah, to put the RRM pulley on you might as well put new belts on as well since you have to remove both belts to replace the pulley.

 

Might as well change them all man! and yes, put on that pulley at the same time...since you have to take it off anyways to access the T-belt. But if nothing else, replace the alt. and P/S belt. Very simple to do those 2...the T-belt took me 7hrs by myself w/o power tools.

 

So you haven't solved the problem yet? As already stated, do the pulley and belts together.