I was repairing my daughter's WDT730pahz0 Whirlpool dishwasher. The bottom dish rack set of wheels was very easy to install. The replacements for the upper set of wheels is different than the originals. In my opinion, the replacements are far superior to the original parts. The problem, as many have pointed out, is that there are no instructions on how to install the new parts. I worked for 15 minutes, attempting to put the pieces together and then install them on the dishrack. That was a mistake. The correct way to install is to first attach the metal section, (that includes the wheels), to the dishrack with two of the four small clips. Once that happens, the remaining adjuster pieces can be attached in a few minutes. Once you know the correct order of procedures, the whole replacement of both wheel sets will take no more than 5-8 minutes to complete. This video provides an excellent step-by-step visual explanation of the process. https://youtu.be/Pj9RskpNHS0 Good luck.