Congrats on the dishwasher(s), you'll have to post pics when you get the new 401 installed. Those are great machines, cleaning is outstanding.
There were quite a few of the Highlanders and Super Highlanders (as pictured above) that had the skinny-post agitators - the mounting was different from the wringers, but they were a little surprising when you'd open the lid and there was no chrome cap with the Maytag logo...