Product review (5 stars): Make Sure You Get All of the Parts You Need
This is exactly what I needed.  This is the one part that did not come in the Agitator Cam Kit that I bought from Amazon at the same time.  It came in an OEM Whirlpool package.  It has been working very nicely ever since I installed it.  And the install is very simply with a flat-head screwdriver and socket/ratchet.  Probably only took me 15 minutes total.

The last time I repaired this problem I only replaced the dogs, and the repair did not last very long (maybe 6-9 months).  Obviously wear in some of the other kit parts increases wear on the dogs as well.  I would recommend using the full kit for your model, such as "Whirlpool 285748 Agitator Cam Kit".  Just make sure you do your research to determine which kit is right for your model.  Another similar kit for a different model of washer than mine is "Whirlpool 285811 Agitator Repair Kit for Washer".