Product review (5 stars): 27 inch kit review.
Hard to say I love it, it's a replacement kit.  What I do love is my dryer not sounding like a tortured cat!

Ordered this kit for a Whirlpool Duet WED9200SQ.  Verified with the Whirlpool website that this was a correct. Package arrived quickly.  Rollers were green colored(kit shown on amazon has red rollers#.  Pulley wheel #white wheel) had a metal washer (original was plastic#.  Found remove/replace videos on YouTube.  Whole project took 2 hours #I took breaks and worked slowly).  Used a Phillips screwdriver and socket set.

**Note, make sure dryer is unplugged before starting.
Used a touch of graphite on each roller/pulley assembly.  Also vacuumed out the internals.  Put all back together and presto, no screeching cat sounds.  Will update as time goes on as to how it lasted.

Pros:  Kit has all parts you need.

Cons:  Instructions were lacking;  were very generic and written for an older front loader dryer.  YouTube has a lot of videos on how to do this.

I would recommend this if your dryer is squealing and you are handy with a screwdriver.