I ordered the bottom door seal and the splash shield kit, just to be safe. I probably only needed the bottom door seal. The repair was pretty easy. It should have only taken 15 minutes, but I accidentally put the old part back on instead of the new one. I did a test run of the dishwasher and was discouraged that it was still leaking, since I had been optimistic that that was going to resolve the issue. It took me a good half hour of tinkering to figure out what I had done.
Don't make the same mistake I did. Keep track of which part is which! Once I got the right part on, it totally resolved the leak. I was pretty happy with the final result.