Product review (1 stars): 4392065  "Whirlpool" Dryer Belt Maintenance Kit
Our dryer belt had broken and I looked in the paperwork and found that the 4392065 kit was the proper part to replace my belt, tensioner and rollers.  The seller I chose had a price that was 1/3 less expensive than some of the others and was supposed to be the proper part for our dryer (4392065).

I have experience replacing appliance parts, so I took our dryer apart, retrieved the broken belt, cleaned the cabinet, and replaced the rollers, belt and the tensioner.  I noticed that the belt looked a little short and that the tensioner fit a little too close to the motor pulley, however, I thought it would work okay.  I started the dryer with no clothes and everything seemed allright, and with a light load, was also okay.  When we tried to dry a heavier load the tensioner roller contacted the motor pulley and it made a loud, vibrating oscillating noise.  Also, the rollers would take a set like an old nylon tire and would thump until they rounded out.  We had to use the dryer like this for a while until the other kit I ordered from another vendor arrived.  The replacement parts kit was a genuine Whirlpool OEM Kit; the belt was longer, the tensioner bracket and roller were like the original and it worked like it was supposed to.  I boxed up the inferior kit and sent it back to the seller for a refund, which they did issue, except for my expedited shipping which cost me 6 or 8 dollars.

The moral of this story is, if you need quality parts for your appliance, order OEM Parts made by the manufacturer that made them for the factory that built your appliance.