2017 cla250 halogen feeling dissapointed

After hours and hours of looking online I have come to the conclusion that I screw up basically right? and changing the headlights for the xenon/hid one is a no go?
was thinking of getting this to see if it would work
http://www.ebay.com/itm/Mercedes-Ben...pYi-ce&vxp=mtr
or would just buying a normal h7 6000k work?


