Ok, here's my follow-up with pics.
1st up are all 6 of them lined up next to each other. I really wish I could've found a pic like this when researching them.
From left to right, they are 401, 501, 601, 602, 603, & 604.
Here's a couple of shots trying to show rod thickness between all 6.
Here's the 401, the one I used today:
Up close and personal with the rest.
501:
601:
602:
603:
604:
Like I said, you probably really don't need all of them. If I had to choose only two, it would be the 401 (obviously for smaller footprint), and probably the 601 for them fancy big wheels where you have a lot of troom to work between spokes. Here's a pic of the 401 and 601 side by side:
Hope this helps.