G'Day Mate! and welcome aboard. Is your fleetside a '67 or a '68? It looks like the US '67 model year because of the lack of fender side marker reflectors, and no nose trim on leading edges of fenders and hood ("bonnet"). But that could be an export model. I've seen pix of Mexican '72s that had no side markers either. Is it possible to find Right-Hand drive components in down-under junkyards? Yours looks like US -style left-hand drive from the pic (unless it's flipped).
