I asked the question a couple of weeks back and got little feedback.... then I remembered the site that I have gone to in the past for my other BMW's.
No association with them, but ECS Tuning has a great a straightforward package for replacing all of the OEM bulbs in the interior. Just swapped mine tonight and it looks great.
One tip that I have learned in the past is to leave the vanity mirrors stock as the color temperature of the white LED's is not pleasing for your girlfriend/fiance/wife to do their makeup!
http://www.ecstuning.com/BMW-F10-M5-...ing/ES2576040/