Large ball joints, small ball joints, & Aussie spindles & brakes

I thought Girling was a British company. Regardless, I'd keep it stock if it were me and the parts were available. Who knows what issues you may encounter doing a swap of that sort unless you get some first hand knowledge from our Aussie friends that have done it. Will U.S. brakes fit on your suspension and work properly? Same control arms? Ball joints? Wheel track and tire clearance? Frankly I don't know.