Product review (5 stars): It installed without any problem with form, fit, or function, for. LG LFX25971ST/1 refrigerator.
The original right-side door-stop to our LG LFX25971ST/1 refrigerator snapped off during when the door was opened recently.  The part number molded / imprinted on the broken original is 4620JJ2009.  The new one is a 4620JJ2009A which is larger and appears to be much stronger made than the original.  It installed without any problem with form, fit, or function.  It is also the same color as the original.  The package it came in displayed part number ZEN4620JJ2009A.