Product review (4 stars): Finally Figured Out My Door Leak!  Spoiler: Not the door seal...
My dishwasher was leaking from the bottom of front door.  Common web wisdom is to replace the door seal, so I replaced it with this part.  I agree with other reviewers that this new seal does not fit as tightly as the original one, so I used a bit of silicone seal to glue it on.  Sadly, the new seal did not fix the problem.  As it turned out though, the leak was not the fault of either the new door seal, or the old one for that matter.

Further investigation showed that the pump cover (located under the spray arm) had become loose, and was allowing high-pressure water to leak past its own seal.  The water inside the pump body was able to shoot out sideways with a force strong enough to push past the door seal.  After replacing the pump cover and seal (https://www.amazon.com/dp/B00LOX049Y/ref=cm_cr_ryp_prd_ttl_sol_1), the leak was finally fixed.  So while it turns out that I didn't need actually need a new door seal, the bottom line is that this new door seal works as it is supposed to even if the fit is a bit loose.