What bulbs do I need for the cluster - brake, reverse & indicator? After my light cluster went flying last week I fitted my new replacement light cluster but forgot to get the bulbs! Got it free from Audi as it was a safety issue. They should not fly off. My guess is that the previous owner had bulbs changed by Audi and they over-tightened the screw going into the cluster and cracked the plastic housing, then it was only a matter of time.