http://www.2.4gigahertz.com/modules/...receivers.html
The R606FS will work with the 12FG, 12Z and 14MZ systems per the Futaba table above. I believe I also heard it will work with the upcoming 7C system but not 100% on that.
The R607FS is the same size and weight as the R606FS and will work with many more TX configurations. I do not know if it will function with the 6EX or not.