Hi Geoff,
It looks like you are making good progress.
Looking at the pictures of your hub it looks like your UMM has a different front axle and hub carriers to the earlier models, the two RHD front axles I have from 1990 and 1993 models both use the double linkage as there is only one ball joint mounting location on the passenger side, there are two on the driver side but only one is used. They must have just used the double linkage so they could still use the LHD hub carriers. Looking at your pictures I can also see hub ball joints are different on yours, mine don’t have pinch bolts like yours do. They must have started using a slightly different axle on the last models which also had the option of a RHD steering linkage.