Product review (3 stars): Pulley has larger profile than OEM part; rubs on tub bottom
The good:
All parts fit a wed6400sw1 whirlpool cabrio dryer and replacing them was easy. I used 3-in-1 household oil to lubricate the rollers and white lithium grease to lubricate the pulley.

The bad:
The new idler pulley has a different profile and is larger than the original part. What happens is the pull now rubs on the tub bottom when under belt tension and there is now noise from the pulley contacting the bottom of the tub. It's better than the old pulley that was completely siezed, but I am concerned about longevity of the new pulley and also wear on the dryer tub from the contact. Unless this is how the original part was intended to perform? I don't see how/why you would want the pulley to rub on the bottom of the tub, though that may be how it was designed.

I've already ordered a new pulley from a different vendor to match that original form factor of the original pulley.