Thanks George, got it. Close enough in number that white may be the way to go. The instructions tell me that the hub should be the same colour as the propellor but it says, for the prop, "propellor colour".
It does not appear to be silver,grey,white nor black as these all have colour #s attached on the instruction sheet.
In absence of proof positive I may just leave it green. If I do change it, black will be my first choice as it is the easiest to cover the green with.
Cheers,
Jeff