This board will replace the following part numbers: • 41A5507-3 • 41A5507-3B • 41A5507-6 • Sears Craftsman 41A5507-5 • Sears Craftsman 41A5507-5B The 41A5507-6C circuit board is compatible with several garage door operators, including the following: • LiftMaster Model 2500B • Chamberlain Model 2500B • LiftMaster Model 2500D • Chamberlain Model 2500D