Product review (5 stars): Good deal.
Replaced the upper left "wheel" in our Kenmore Elite (Model # 665.16052) dishwasher, which was made by Whirlpool.  Looks and fits exactly like the original -- and was much less expensive than going with Partsdirect.  $15 total and it was here in a few days.  Took me a few minutes to open the box, remove the old one (damaging it wasn't a concern, which made the removal very fast -- yes, it snapped in a couple of places), and figure out how to install the new one.  The last step is fairly interesting requiring some twisting and sliding (of the part not the installer). Nothing complicated but I doubt it would fit using any other combination of movements.  Works great!