Product review (5 stars): Wrong picture shown
W10311986 is the stock number for the LOWER rack.  The picture shown is the UPPER rack.  That said, this new lower rack's silver color matches the W10779821 upper rack I purchased from Amazon recently and works fine.  As others have mentioned, these racks do not come with assembly/installation instructions, but there are YouTube videos showing you how.  Search for "install W10311986 dishwasher rack," for example.