I made a purchase - to inspire me to get some more accomplished...
They come from Iowa80-dot-com. (Item Number: 29172 for those that are interested.)
They also come with three clips for mounting.
They were surprisingly inexpensive -- shipping doubled the cost, but they arrived at my door ... for 30 bucks.
(And yes I tested to see if they will fit over the axle hubs and dust caps -- they do!)
I will try to document what I do to adapt them to fit the harbor-feight 12"- 5 bolt wheels.