Product review (5 stars): Superior Replacement Part
This is an excellent OEM replacement part and is a total redesign of the original all plastic roller system which failed after about 4 years of bi-weekly use. The main body of the replacement is now stainless steel and looks so different that that I was reluctant to order until I did some additional research. This kit also fits our Kenmore Elite Ultraclean Dishwasher, model # 665.127773K310 and it fits many other models as well.  Beware though there are two different kits that are exactly the same except for the wheel size. This kit has 0.90" wheels (about 7/8"). The other kit has 1.25" wheels.

The kit did not come with any instructions, but there is an excellent YouTube video (use the Whirlpool part number to find) that can walk you through the entire removal and assembly process step by step. It's not entirely intuitive, so it's worth hunting down the video. All it takes to remove old parts is a small flat screwdriver pry off off cheeks of the height adjuster and a Torx(T15) screw driver to install the new parts. This kit came with the Torx adapter which fits on a Phillips head screw driver to tighten 4 screws. Everything else snaps together. TIP> Remove and replace one side one side at a time.