ZA B110s used Borg Warner rear axle assemblies (local content). It is the
BW60 or maybe BW68, same as Australia-built sedans
However, I wouldn't be surprised if the brake shoes differ, maybe Girling international vs PBR Australia
You could simply swap a Aussie spare coupe axle assembly under the car (one that doesn't leak and has common brake shoes). Sedan and Coupe axle assemblies differ. When swapping, also get the matching tailshaft. Coupes outside of ZA use the japan-built axles