Product review (5 stars): I recommend if the problem is just the small white wheel
Fits my Kenmore dryer perfectly.  It took me about 3 hours to change all 5 wheel wheel and belt.  I recommend if the problem is just the small white wheel , which is the problem 99 percent of the time.  You can purchase the wheel only and it will take you about 30 minutes or so to change it.  I recommend  http://www.appliancepartspros.com/whirlpool-belt-tension-pulley-6-3700340-ap4373393.html