Product review (1 stars): This product does NOT fit the Whirlpool Cabrio model WED6400SW0 ...
This product does NOT fit the Whirlpool Cabrio model WED6400SW0 as per the Amazon partfinder says.  Cabrio requres a different idler pulley wheel, 4 drum rollers and the belt.  I would have returned it for improper description, but I had to use the belt from it.  There is no option in Amazon to return partial product for partial refund so I am stuck with 2 wheels and a tensioner I can not use.