Product review (5 stars): Whirlpool-made part for a Maytag dishwasher? Yes.
It seems that Whirlpool makes the part for my Maytag dishwasher. My existing rack was starting to rust, so it had to go, but the dishwasher works great still and similar replacements cost $700 and (way) up. So while this part isn't cheap, it's a far cheaper alternative to replacing the dishwasher. The replacement rack is nearly identical to the existing rack, and an online search quickly pointed me to all the tips I needed to remove the center part from the old rack (which comes separately and costs ~$50) and install it on the new rack. The rack is a perfect fit in my dishwasher. I netted big savings over buying the rack at dealer markup and paying the service tech to "install" it, and even bigger savings over buying a new dishwasher.