Yes: the Mk5/1 (an uparmoured Mk5) with the 20-pdr combined with the RG was, as far as I know, unique to Australia, though Australia did not officially list a different nomenclature for that combination, leaving it as either a Mk5 or Mk5/1. Neither did Australia use the 'LR' suffix in the nomenclature to indicate the addition of the rear armoured fuel tank.
The combination of the 20-pdr and RG required a different sight reticle, (among other changes), to the 105-mm - equipped tanks with RG.
Mike
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