Product review (5 stars): Great replacement for Kitchenaid dishwashers
Got these to replace the ones that came with my Kitchenaid dishwasher.  The plastic clips holding the little wheels on broke off and didn't hold the rack on the rails very well.  The rack would bind and eventually started popping off the track.  Being a Kitchenaid I was expecting the repair to be very expensive.  Till I found these.  Shipping was really fast too.  They came in half the time that Amazon projected.

Taking the old ones off and putting the new ones on was really easy (even without instructions).  Wasn't sure they would fit when I took them out of the box.  The ones on the rack looked like they were bigger and had more components.  After taking the retainer clips off the old ones they ended up looking exactly the same as what I took off.  The rack now slides in and out better than brand new.  Don't remember the rack ever sliding in and out as easy.  There were single ones for sale but thought I should replace both while I had it apart.  Glad I did.  Both sides had broken clips that hold the wheels in place.