Yep, the spacers are nuts. They work well for the application, I like the "industrial" look personally //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
They serve two purposes:
1) Cooling - the 4-spoke has no basket windows.
2) Clearance - I cut out the hole in the bottom of the 4-spoke larger so the center of the spider has more rearward clearance.
These are not production - just a one-of custom driver.
I may consider building more in the future, but not right now.