Product review (5 stars): Fit Kenmore Elite HE Dryer
Not necessarily an "easy" DIY project - but it can be done if you're patient.  Watch a youtube video and get the idea.  Remember, some dryers need four of these drum rollers.  Two in the front and two in the rear.  And-while you've got the dryer apart, you might as well replace the belt.  Good preventative maintenance.