I have been looking for a while and haven't found any either. I was going to call Moon and if they don't know, I'm looking for something else.
Don't know about spider caps, but a few months ago there was a tech thread showing how to adapt those chrome bullets. Night Prowlers has 'em, as well as others.Contact Curious Rash , he knows what I'm talking about. These are a lot cheaper than spider caps, which may not even be available for your bolt pattern. Maybe this will help.
There are no 5 on 5 spiders being produced right now. I got 2 from a hamber and those are the first ones I had seen for sale. Thats after 3 years of looking on ebay and every where else. They would be easy to make just use those bullets they sell and have someone machine you the flower shaped deal weld in and chrome. Good luck Brandon