If you put up photos of the dash and grille, I can certainly help identify the year. The chassis number would be even better! Usually by the left front shock mount but can also be down by the rear ones too! You might still have a data plate on the seat riser or on the top of the firewall. A blue one is the Australian issued one.
I don't buy stock parts so can't help you there, but one supplier here is Marathon Spares.
https://marathonspares.com.au/
Also if on Facebook, make sure you join our group. Their are guys with original hand written records that can give a good early history if you have the blue data plate.
https://www.facebook.com/groups/912295672146456