841LM Automatic Garage Door Lock upgrade kit
This kit will upgrade existing 8360W and 8550W units to be compatible with Liftmaster 841LM lock.
1) 841Lm lock
1) 050DCTWFLK logic board
1) 041D0216-2 Plastic end panel to house above board
*** If you have an 8550 or 8360 without the W in the part number then you would have to buy a completely new unit there is no upgrade available.