Good luck on finding a set. I was also looking for a set a couple months ago. I bought one that didn't have them because the previous owner removed them to make the amp fit. He lost them when he moved into his new house. Im pretty sure they are heat sinks and mine has been running flawlessly without them for months now.Looking for the two top covers for powerbass xta 5000d that were damaged in shipping. Please Pm me with price and Thanks