Product review (5 stars): Get your hand vac ready!
In order to install one of these, on my Frigidaire stack-able unit, I had to pretty much take my whole dryer apart.  But that is nowhere near as bad as it sounds.  Pretty sure it took me longer to vacuum up all the excess dryer lint that had accumulated inside than it did to actually install this part.

Since you have to take the dryer apart anyway, you might as well spend an extra 7 bucks on a new belt too instal while you are at it.  Even if you buy both the genuine Frigidaire bearing kit and the belt and install them yourself, you will be spending about 10% as much as you would by having the bearing kit professionally installed.