I know that these will be expensive to ship to Aus but I would imagine they are probably fairly hard to come by nowadays. I bought one for my V37 1966 Self Propelled but they fit a lot of other impulse starter models of the time, Corvette etc. as listed on the pack. This ebay seller still has 3 more available:
No, drum only I'm afraid. I haven't put this on my V37 yet, it's been buried in the shed for a while so I can't really remember the nut/washer assembly.
Is a stock of these still available in Aus? I was surprised to find them here.