I actually don't know since I don't have one. It seems like they come with most everything you need. Do they come with a DRO? If not, I built a ShumaTech DRO-550 kit with the LCD-200 option recently for my machine, and would highly recommend it if you're handy with a soldering iron. The firmware is "Open Source" and is undergoing continuous improvements. Check them out at Home Page | shumatech.com. I'm currently in the process of installing linear glass scales made by Sinpo (.0002" resolution). A DRO is more useful on a manual machine than for CNCs like the Patriot.
What kind of racing do you do?