Has you car got MFSW ? Reason I ask is that although mine is a 2005 build car, it did come from the factory with cruise. When I fitted the MFSW however it wouldn't work. I had to change my module to an AK unit.
Can't remember (as I'm at work) what the Rev is of my original unit but it might have been an "F" like Darren said above, but I still have it somewhere, and you are welcome to it if you want to try. Like I said, it came on my car fitted with cruise as standard from the factory but without MFSW ?