I've just had a quick mail from a wellknown seller of 1:43 cars (as not to advertise!) and officially there doesn't seem to be around. He said you can basically "hint around" or do some painting - at that scale most details regarding eg. suit decals are lost.
I don't know whether you can/want to contact your local Tameo agent. Some of the cars have the driver figures included, with their decals obviously - I just got one of those. Therefore if you know that the driver you want was in one of those kits, maybe those decals can be ordered.
Good luck! And if you do manage to get an alternative source, please be kind enough and tell us about it.