Mitch - I cannot recall why I picked this paint, it might have been a RGP thread from years ago. I'm told it is the equivalent of the USA paint

Powerplus "Spray and brush system"
GUNMETAL
Product code PJ9190

http://www.supercheapauto.com.au/online-store/products/Power-Plus-Touch-Up-Paint-Gunmetal-PJ9190.aspx?pid=1229#Description

I bought it from Supercheap auto. I bought a small test spray can 150g. I never tried it, but I was told I had to use the Powerplus primer.