@brettmag I'm going to have to disagree with @lpskier on this one. This is kind of tricky and I hope I don't confuse anyone, but it breaks down like this:
Every ski manufacturer has the same hole pattern for their front bindings. HO/Radar/O'Brien have the same rear hole pattern, and Connelly/D3 have the same rear hole pattern in their skis. (But if you ask nicely D3 will send you a rear HO hole pattern)
The rear Radar bindings however are setup to be compatible with all ski manufacturer hole patterns.
The long and the short of it is, if you want to put Radar bindings on your Connelly ski, you won't have a problem, if you want to put the Fastback bindings on your new Radar ski, that won't work out as well.
My personal opinion would be to get off of the Fastback bindings, you don't really release from them too well and I've know two different people that have suffered a broken ankle from a crash in those bindings.