Product review (5 stars): Better than the original part on Kenmore Elite
I used this replacement part for a Kenmore Elite 665.12773K311. This is a better quality replacement for the roller assembly that came with the dishwasher. As I was disassembling the original parts with the broken wheel connectors, I saw several other stress fractures, so I feel safe in saying the original roller assembly was crap.  I followed the instructions that were linked in the packaging and got the upper track fixed and working again.  The main roller assembly is metal, with the wheel attachment superior to the original part.