Vixie

I'd like to change ambulances back to their pre-euro-yellow colours, by creating a version, in order to create more local variation. could you advise me how to do this please? thank you.

I;m a traditionalist, and euro-yellow makes me feel sick, it;s really offensive to my eyes, I was wonder if anyone knew a way to quickly re-colour vehicles with one colour to another? In either Emergency 4 or 5?