A damned good question (which I must confess made me laugh for it's clean simplicity of asking!). Touched on here, but no answer: http://ww2talk.com/forums/topic/24073-heinrich-himmler/
SS1, (on a BMW?): AHF thinks SS2 = Daleuge: http://forum.axishistory.com/viewtopic.php?f=38&t=124805 (Though there seems some uncertainty, eventually) Kurt Daluege