Product review (4 stars): Worked on my Whirlpool Cabrio dryer
I used the belt and guide wheels on my dryer and the squealing stopped (sound came from the tension pulley, which was cleaned and lubricated and reinstalled).  Could not use the tension pulley due to the type.

My dryer utilized a heavier pulley type with a bushing pressed in.  Had to discard the plastic one that came with the kit.