OK Update.
Manage to find cheap a Ranger Sync3 Unit.
Ordered GPS Antenna
Havent ordered the USB Media Hub unit yet.
Sync3 Head unit 1.jpg
Contacted a few places, including Tonkins in Adelaide, A melbourne company who have a lot of exprience in repairs etc.
All have told me its a rewire and not straight swap, so wish me luck.
Probably try it out in next few days. Sure I will get some errors, no usb hub, no reverse camera and no GPS......
Other bug is FGX is single zone. Sync 3 is for dual zone.....