Someone asked this question a while back, unfortunately the roof bars themselves do not have a paint code or so i read.

 

Ah nuts, will search it maybe someone posted an alternative that's a good match. Cheers

 

Any good painter or powder coater (i'd recommend powder coat) should be able to match it.

On the other hand, why not get front and back done at the same time to match... Little bit more money but you know it'll be good then