Presently, original equipment manufacturers (OEMs) use LEDs in interior applications (dash, radio and other places), CHMSLs (3rd brake light) and rear combination systems (brake and sigal combinations).  Soon, the SYLVANIA standardized LED bulb will be designed into vehicles.  
  
As for LED replacements for standard incandescent brake lights, reverse lights and interior lights, check back soon because we have new products being developed as legal replacements.

LED lights for use as replacements for standard incandescent lights are available from other suppliers.  Most of these products, though,  do not meet performance requirements.  Because the light distribution from an LED source is very different from an incandescent light, it is very difficult to use an LED replacement while maintaining the required system light output.