Product review (4 stars): Amazon service was excellent.
This is an upgraded replacement for the original part (that came with the dishwasher) that was all plastic and in which the plastic part that held on the wheels broke within a year of use (could not handle the temperature and humidity conditions of a dishwasher). The instructions were not the easiest to understand. The kit originally send had two right side adjuster tabs instead of one right and one left. Called Amazon, they sent a new kit; I took out the left tab, put  the extra right tab into the kit and returned the kit to Amazon as instructed by the Amazon representative.  Amazon service was excellent.