yo, i did some research on ur thing, and the only difference is the bulb,
The 9006XS ST Bulb Has A Straight Connector Design Unlike The 9006 ST Which Has Curved Connector Design, Fitting For Most Chrysler, Jeep Products & Others
the throw the same light except the bulbs are just in different directions to fit different vehicle applications that carry the 9006.
also, SILVERSTARS are bad ***, by friend bought some for his 88 MONTE CARLO SS and damn they look so kool, i would recommend them, i would get them off of ebay as u can save around 15-20 bucks for both bulbs, AUTOZONE carries them at around 20 bucks per bulb, i think they would look best with brand new clear headlights, as in not on those dingy yellow old ones.