1 H13 or 9008
2 most physically move the bulb inside the reflectors
aiming point with a magnetic solenoid for the mechanisim.
Turning on and off HIDs for low to high beam just dont promote
long bulb life. Its just not good for them. So they move the bulb
from the low beam focal point of the reflector to the high beam
focal point when you select high beams...
3 there sholud be all sorts of site sponsored clickable links
at the top and bottom of this thread. Or use the search function
and msee what the opinions have been in the past.
personally putting a HID bulb in a housing designed for
incandescent filiment bulbs just dont work so well.
The Ford OEM HIDS for the 09s fit and work well...
And they fit 06 S197 stangs...