Product review (5 stars): Go with this one if you have a pulley without a wheel.
The dryer belt broke on my Whirlpool, so I decided it can't be that hard to replace it.  I bought belt from Amazon, watched video and of course the original pulley was not wheeled but one that I learned Whirlpool only used for 2-3 years before going back to this design. The dryer is 16 years old so the pulley has done it's job  I reinstalled old pulley, which was still good, but thought a wheeled one would be better.  So I ordered this one to replace the original one. By replacing it myself I saved at least $180.00 from not using appliance repairman.  Anyone can do it but you need two people.  I did not and it took an extra 30 minutes.