Product review (4 stars): Not The OEM (Whirlpool) Version, And I'm Not Rating the Part's Design
Not the OEM version, as I ordered both these and ones directly from Sears Parts Direct.  Luckily the Kenmore/Whirlpool versions from Sears were free as they were less than one year from when I got my first set of replacements.

As many other reviewers have noted, this is a horribly designed part.  I assume it was deliberately designed to fail.  My first set upon buying a brand new Kenmore Elite dishwasher (made by Whirlpool) lasted about 8 months.  The 2nd set lasted longer, as one broke with about 11 months of use and the other hasn't broken yet.  I bought 2 of these aftermarket items and put one in place of the newly broken one, so we'll see how it goes.  As of now I have 3 parts in reserve, and I recommend you stock up some as well when the price is low.  Buying them here saves you 40 to 50% versus Sears Parts Direct, so if they hold up as well they are a bargain.

These are an exact match for the OEM version, with the exception that the plastic looks slightly different.  I had no problems installing one in place of the broken OEM piece.