Thanks VCCOMM :), I did find a aerosol of International Orange at supercheap and autobarn for $4.30 .. only the cheap paints.. not sure how well they cover... ill have a look into CHEVY Orange
[EDIT] found some CHEVY orange though much more costly than the international orange.. but my guess is its better quality paint..
INTERNATIONAL ORANGE:
supecheap: Export Aerosol Paint - Enamel, International Orange, 250g
Autobarn : MOTORTECH INTERNATIONAL ORANGE SPRAY PAINT 250G
both $4.29ea
walkershardware.com.au : Boston Spray Paint International Orange 250G == $4.50 (PERTH ONLY)
CHEVY ORANGE:
superheap: Dupli-Color Aerosol Paint - Engine Enamel, Chevy Orange, 340g === $16.39
autobarn : VHT ENGINE ENAMEL ORANGE CHEVY 312g === $12.79
varietypaints.com.au/ : RUSTOLEUM CHEVY ORANGE ENGINE ENAMEL === $14.95