Geez Wozza, dunno 'bout Vic, but I'd guess not too much diff. from Qld for pre -70ish, (pre July'76 really- that was when indicators became mandatory, and maybe other stuff), in our case so long as there is 'a' mirror you should qualify, better if it's something close to 'a standard/popular for the period'...depending how the assessor interprets the guidelines. (ADR's didn't happen till the '80s..?)
I'd say have a yarn to whoever you'll have do the checkover and see what is required...?
good luck, duTch