LED tails?
 

Totally newb question:

Looking at '08, '09, '10 C63's I've noticed that some have standard C class tail lights, some have LED turn signals and standard running/brake, and others have LED turn signals AND LED running/brake lights too.

Which ones come with which years? Is there a certain year they start the all LED tails? And can they be easily retrofitted to a car that didn't have them?

From 09-11 there are two options, tails with LED turn signals or tails without. Starting in 2012 the tailights have LED turn signals and LED strips above and below the turn signals. The brake lights are not LED however from what I have seen. I may be wrong on this.