I was of the understanding that the brackets and heat sinks and virtually everything about them was different (other than the exterior shape). Are they compatible with the mounts for the old lights? (Don’t get too mad at me, I’m not particularly well informed—just watched a quick vid on the differences)I was just reading on a Tesla Facebook group that you can request Matrix headlight to be installed later if you're given the old ones. The poster even shared screens showing the conversation and appointment information. He insisted on it while calling the main 800 number and they agreed his car should have them and they'll be adding them during his service appointment.