Hola os dejo unas referencias que he pillado de una web alemana 
  
Salu2 
  
PD: no lo traduzco por pereza pero creo que está claro  
Here the simplified overview of the partial numbers of the single available TT ² light switch  
  
8J1 941 531 M = bright sensor, Halogen  
8J1 941 531 A = bright sensor , xenon, with DRL (daytime running lights) 
8J1 941 531 G = bright sensor, xenon, without DRL 
8J1 941 531 N = Halogen  
8J1 941 531 D = xenon, with DRL 
8J1 941 531 J = xenon, without DRL 
  
Respect: the partial number, please, with the order still by 5PR supplement this is the Farbcode for the extended aluminium package of the TT  
  
Uniform price of the switches(counters): 55,28 €