Product review (5 stars): Everything was a perfect fit. The idler pulley is a slightly larger ...
Purchased this kit to service my Whirlpool Duet Steam Dryer, model WED9600TW0.  Everything was a perfect fit.  The idler pulley is a slightly larger diameter than the original part due to the flange height being higher (guessing this was done to lessen the potential of the belt to skip off the pulley).  Did not come anywhere close to rubbing on the drum of the dryer like other reviewers stated for this kit, so it makes me question if they routed the belt properly around the idler pulley and motor, or if they did not verify the size of the dryer drum.

Anyway, couldn't be happier.  The kit vs purchasing everything individually is much less expensive, and I recommend buying this and replacing all of these parts at the same time.  Be sure to clean the roller shafts that the wheels and pulley go onto with a solvent, wipe clean and dry, and then apply a thin coat of grease.  This will keep the squeaking to a minimum, and improve the performance of the parts.