Sears Craftsman 41A5021-3M-315 Receiver Logic Board Sears Craftsman 41A5021-3H-315 Garage Door Opener Circuit Board New part # is 41A5021-3M-315 (same part letter doesn't matter in this case) Works with the 315mhz unit with purple learn button. Replaces all previous 41A5021-3M-315 and mod41A5021-3H-315 Replaces all previous 41A5021-3M-315 and 41A5021-3H-315 models