Hi Michal. Armature LU463988 is correct for all Triumph models in the 1939 parts list and the WD models. Who understands Lucas part numbers??? As far as I'm aware, apart from rotation, pickup and cable locations all the MO1's are about the same, so any armature could be configured for your mag. I would be reluctant to buy a ready to fit replacement without knowing the supplier. Rather send your old unit for rewire to a qualified firm. Ron
