I see that on the US cars that the bulb and holders are different than everywhere else. What a surprise....

I'm guessing that the headlight is the same and that just the bulb and holder are different. Am l correct in thinking that to fit H4s its just the bulb harness that would need changing out lf l want to fit a normal H4 set up and not the H9004 ?

 

Headlights are 100% specific to USA. They are much weaker than euro/UK spec (e code vs DOT).