theres a similar thread with recent posts regarding 5 stud diff
although your 5 speed stuff will prob be new, i'd guess anything from a falcon 5 speed wise will NOT work cos of where the shifter comes out, the toyota boxes(some of them anyway as in supra) have different places to mount the gear shift, not a simple conversion , tail shaft, box mount and clutch and speedo mods CRS
www.rodshop.com.au would have done both of these mods before as would other places