I don't know honestly. On my model 2 they were different.SoundMaster 391 wrote:Will these brushes work with a Model 2 siren?QuantumCurse wrote:The armature. All of the brushes are the same on the Thunderbolt I have so I can't answer that.SoundMaster 391 wrote: Is this meant for the armature brushes or the brushes that ride along the collector rings?