Product review (5 stars): correct for Whirlpool LGB6400KQ1 dryer
My squeaky dryer finally decided to stop rotating after 15 or so years of use.  Opened it up and the belt was torn apart.  I decided to get the kit so I had a chance of getting rid of the squeaking since I had to tear it apart for belt replacement.  This comes with what you see and a few of those triangle clips.  But this is better than factory in my case.  My belt tensioner did not have a rotating pulley, just a half circle plastic guide that the belt drags on, so I consider this an upgrade.  Everything was an exact/correct fit,  Whirlpool LGB6400KQ1.  About an hour for all cleaning and reassembly.  Dryer is now very quiet like it used to be, and it rotates again.