Bren -
I have that OFNA LX / COMP that I ran 2nd at Dalton - it just needs some screws and good cleaning - the diff's have 20 minutes of run time on them - they are f5 / c7 / r3 - I bet I could have it together in couple of hours.
It's this one ... if you need it... 48t Spur and 43t / 13t diff gears.