Product review (5 stars): Do Some Cleaning Maintenance Before Buying Parts
No, I didn't purchase this part; but, I have something useful to contribute regarding a leak at the bottom side of the dishwasher door.  Since this is a Whirlpool parts number replacement as per my Kenmore owner's manual, I gave it five stars so I could make my comment.  We own a Kenmore Ultra Wash model 66515795790 purchased 1998.  It had worked flawlessly all these years except for minor parts replacement on the upper spray arm and dish racks.  Recently we started getting leaking from the bottom door corner.  I researched, read/watched videos, etc to learn the possible issues.  Be aware, many videos I watched did not perfectly match my dishwasher design; so, be careful before you start doing some of the steps prescribed for replacing the door gasket, bottom baffle, etc.  I had no clue how the door gasket was cemented in place; it's not cemented; it easily/carefully pulls out and the new gasket merely pushes into position.  In both the bottom interior corners, near the front, there are "tub corner baffles."  They also just pull out of position.  There is also a "door vent screen" which is rectangular on this dishwasher and is located on the top, interior side of of the door; it's made of plastic.  It simply pops off by carefully inserting a butter knife and prying it out from the inside of the door.  There are two interior tabs that hold it in place.  Here's what I did to correct a leak that had become pretty serious.  The tub gasket had calcium-like deposits adhered on the front side of the gasket.  I sprayed the gasket with a Lysol style cleaner and let it soak for a couple of minutes; then I used a super soft brush and cleaned the front of the gasket.  Starting at one end, I carefully pulled out the gasket and discovered "crud" along the side/back of the gasket; I cleaned the groove the gasket pushes into and reinserted the gasket.  I discovered the tub corner baffles easily pulled up/out of position; I removed them; cleaned them and the holding slot; and reinserted the baffles.  From researching, I learned on a blog that if the door vent is clogged, unusual pressure will build inside and force water out.  I had no clue how the vent face came out so I inserted a flat blade along the edge of the vent and could see it giving way; with a little force, the vent door popped out and I discovered an unbelievably disgusting amount of soft slime crud inside the vent.  That got cleaned out and I snapped the vent grill back into place.  We've been using the dishwasher for about two weeks now since the maintenance and we have not seen even a drop of leaking water.  So, I must believe water leaking from the bottom side of the door can be attributed to the door/tub gasket, corner baffles, and clogged vent -- or a combination of all three.  You should also check to be sure the spray arms are sound -- they do have quite a bit of "play" in them, but the screws should securely hold them against their own gasket.  If cleaning these parts does not fix your leak, or if the gasket is actually deteriorated, then this is one of the parts you'll need.