Yeah I forgot they were listed in the plans but the motors in the link are different now (things change over time). But, as mentioned in my edit above, that just means the older ones are cheaper now.
Mine is way overdue for some maintenance so I would love to remove the motor cover this summer and at least change the brushes in the first four motors and due a little housecleaning. I’ve probably done 1000 flow tests and never had the cover off and when I’m probing a port they are running quite awhile