Another suggestion, afu-if you do Rob's tip, you could take the paint sample to a local bodyshop and have it
digitally matched!

They use a special scanner type tool that digitizes the colour, then calculates and spits out a paint match formula on the computer. Then you can have your paint mixed up. They had one of these gizmos at the dealership where I used to work and it matched paint (even complex modern metallics) darn near perfect! Might be worth a shot.
Regards,
Wannabe
