Product review (5 stars): PERMANENT FIX FOR WHIRLPOOL WDT910SAYE RACK ADJUSTER
Get this and NOT the plastic OEM Rack Adjuster replacement (Whirlpool Part Number W10350375: ADJUSTER). They are about the same price, but this replacement kit is a robust upgrade and permanent fix for broken plastic roller clips that regularly fail.  After a second plastic roller clip failed, I installed this metal adjuster kit.  PERFECT!  There are numerous videos on the web to guide you through the installation (http://www.appliancevideo.com was most helpful).  Make sure you order for the correct wheel size for your dishwasher.  This kit, W10712395, replaces the small roller W10350375).