Product review (4 stars): Beware of the dreaded tri-rings
Following a couple of Youtube videos, I was able to replace the belt and rollers.  In my case, the rollers had worn and the dryer was making a terrible squeaking sound until it warmed up.

The little tri-rings are a royal pain.  To this day, I cannot figure out how to remove or insert them without snapping one of the sides.  They are brittle as heck.  So my rollers are being held in place by tri-rings that are broken on one side.  They have been holding fine for 4 months, and because they don't have any stress on them under normal conditions, I feel they are safe for the rest of the Whirlpool's life.