Product review (4 stars): You can get this part for FREE (and, why I'll never buy another Kitchenaid dishwasher again)
Like many others, I'm the unhappy owner of a Kitchenaid dishwasher whose top rack assembly has busted repeatedly. This was a manufacturing defect -- the wheels that held the top rack were set on plastic axles that over time (1-2 years) degrade and break, most likely because of the machine's heat. This has happened THREE times to my dishwasher in the past 5 years. It's important to note that Whirlpool has RECOGNIZED this as a manufacturing defect, and that they will ship you the replacement parts FOR FREE if you request them. Simply go on the whirlpool customer feedback site, engage the CHAT function and request that they send you one. (You will need you model and serial number, which is found just inside the dishwasher door).

One note about Kitchenaid: These USED to be the best, longest-lasting dishwashers in America. They WERE owned by Hobart. At various houses, I have owned four of these machines. The first two were manufactured by Hobart, which sold the brand to Whirlpool in 1986. Those lasted 25 years or longer with few problems. My second two dishwashers were Whirlpool-manufactured and they've been disasters.
The third dishwasher lasted 5 years, until it simply wouldn't clean anything in the top rack. The fourth dishwasher is what we're on now. It's had four top rack wheel-axle replacements, and on one occasion we had to replace the central motor (at Whirlpool's expense). Right now the touch control panel is on the fritz -- it has a mind of its own and frequently turns on the Cancel/Drain cycle all by itself. When this happens, it usually requires us to go down into the basement and flip the breaker before we can get it to run again.

The repairman who who replaced the center motor on the fourth machine informed me he works on Kitchenaid dishwashers very frequently -- hint, hint. I asked him what kind of dishwasher he has in his house and he said "Bosch." That's the brand he repairs most infrequently, he said.

I think anyone should take these facts in to consideration when buying a new dishwasher. My wife and I certainly will when our current Kitchenaid quits, which probably is going to be soon. And the next one will not be a Kitchenaid.