they should fit your car no problem
I paid $54 for the tensioner pulley and $12 bucks for the A/C Belt at
If you havent, then swap both belts at the same time.
http://www.infinitipartsonline.com
Its weird to have a problem with this pulley at 50K. The dealer told me that they normally don't see this as a problem unless you have 120K or so