Replaced original idler pulley on my 2003 Ford F150 V6 with this one. Stopped squeaks and looks like original. Perfect fit. Does not come with new hardware. Pulley only. Reused original TORX 50 mounting bolt. Use a good TORX socket so you don't strip the bolt.
Purchased this for a 2006 Taurus with a 3.0L SOHC engine. There is only one idler pulley but part listings show two different parts, which are different diameters. Mine was 90mm, which is about 3-1/2 inches. I believe the other was 76 mm, or about 3 inches in diameter.
My serpentine belt has been noisy for a couple months. Yesterday the belt fell off while driving. I placed the belt back on the pulleys and started the engine, after about 2 minutes the idler pulley flew off. All of the pulleys appear to be in good condition, but in not sure if the belt tensioner assembly needs to be replaced.