In case anyone is interested:
http://www.mopar.com/halogens_overview.htm
For review:
9006XS = Low Beam
9005XS = High Beam
9006 = Fog Beam
The XS has a straight base vs. the 90-degree bend on the others. No 9005XS listed yet. Seems odd not having the 'other half' of the headlamp similarly occupied.