Product review (4 stars): The sound to me was like that of the rear drum bearing failing
Fit and works perfecltly now!  This is a design weak spot for Frigidaire (and other brand dryers that use the same part) dryers.  The fan/blower wheel inside develops cracks near the shaft and the result is a sound that permeates the dryer masking where the sound is coming from.  The sound to me was like that of the rear drum bearing failing.  I replaced the plastic cup and greased my rear drum bearing but that wasn't it.  (Although I do recommend at least greasing it with a good white lithium grease while you have the dryer apart if necessary.)  While you have the front of the dryer look for the cracks on the blower wheel.  If you have cracks, replace this part.  You will be glad you did.  My dryer is working fine now for around $60.