YOUR INFO SAYS THAT THIS PART WILL WORK FOR A LIFTMASTER 8550WL MINE IS A 8550W ARE THOSE THE SAME OPENER?
The LiftMaster 8550W came out before the autolock feature so you will use board number 050DCTWF.
The LiftMaster 8550W came out before the autolock feature so you will use board number 050DCTWF.