Oz laws require amber.
That is why yank imports over here had to have the red flashers disconnected and usually
accessory amber lights fitted,
What was that model around the late 50/s with a huge horizontal fin, a chevvy belair or sumthin'.
They hung a bullet amber flasher under the fin over here to legal it..
Early mustangs had amber lights in the reverse lights as flashers.
We did have one model holden about '57 , the FE model with a red flasher but none other .
I seem to recollect it was because they thought the red flashing light from a distance could be mistaken for a fire engine in the days when they only had red flashing lights.