Product review (5 stars): Great replacement dishwasher brackets
I bought an open box Kenmore dishwasher and unfortunately the under the counter mounting brackets did not come with it.  Fortunately though, it's a fairly universal product and even though these said Whirlpool they worked with my dishwasher.

As with all of these types of brackets, installation was a breeze.  You simply insert the rear end of the bracket into the dishwasher frame and then bend the tabs on the end of the bracket upwards to secure it into place and to prevent the brackets from sliding back out.  You then slide the dishwasher into its enclosure beneath the counter and with the front door open you screw a screw through each bracket into the countertop above.

For anyone in a similar situation I would recommend these.  The only caution I would have for anyone buying these is to buy two as this is a singular item and you will most likely need a pair.