Product review (5 stars): Perfect Fit, Fairly Easy to Install
This is a fairly easy fix, albeit time consuming (you basically need to take most of the dryer apart and remove the drum).  The new part fits perfectly, and there are plenty of YouTube videos that give you the basics if you are unsure of what to do (although it is pretty straight forward).

One quick word of advice - if you are changing this due to your dryer squealing, consider changing the idler pulley first.  It's a quicker, cheaper fix that may fix the problem.