Part Number: 0570409-1 (Heat sink ay)Part Number: 0570409-2 (Heat sink ay)Part Number: 2134752-3 (Heat sink ay)Part Number: 537-88OPT1 (Heat sink ay)Part Number: 537-88OPT2 (Heat sink ay)Part Number: 537-88OPT3 (Heat sink ay)Part Number: 537-88OPT4 (Heat sink ay)Part Number: 631R303G01 (Heat sink ay)Part Number: 631R304G01 (Heat sink ay)Part Number: 637R317G01 (Heat sink ay)