Product review (5 stars): These are the parts the dishwasher should have come with in the first place!
If you've had an axle break on the top rack of your Whirlpool dishwasher, this is the kit for you!  While you can find and purchase individual component parts, I recommend purchasing this kit rather than doing that for two reasons: (1) This kit is designed better than the original top rack adjuster parts (metal side bars and FAR superior axles!)  and (2) When using this kit you simply discard all the parts from the original adjuster assemblies and install the new assemblies.

The kit is exactly as pictured with parts to replace the adjusters on both sides of the rack. The only downside to this kit is that the included instructions make it look more difficult than it actually is.  I spent 15 minutes trying to decipher the very dark photocopied instructions and finally gave up and found a YouTube video that cleared up all of the confusion. I recommend this one: https://www.youtube.com/watch?v=otUn8eoceBw (and I have no connection to the makers/owners of the video - it was just extremely helpful).

You will need a T15 torx screwdriver to secure the screws on the replacement assembly (which, of course, you can purchase on Amazon). It took me less than 10 minutes to complete the repair after I watched the YouTube video.