52mm will do, if you're ordering parts from the UK they are quite cheap.
606435 | Hub Nut Spanner - for use with bar - Paddock Spares
I think the nut is 1 1/4" Whitworth (1 3/8" BSF). A discussion on the forum years ago mentioned a box spanner for an immersion heater in a hot water tank being a similar size (may have been NZ rather than Australia though).
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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