This is probably a dumb question, but is there a way to tell where you have HID headlights without having to pull the headlight assembly out...
And what size are the HID headlights?

 

Turn them on.

 

headlight level control next to you dimmer on the left side of the steering column

 

all 03 evo's had HIDS

 

Ah!
Okay, the level control was a giveaway.
And they aren't the stock lights, otherwise It wouldn't have been a problem.

So here's the hard expensive part of replacing the one bad one...
Know what size they end up being?

 

Well if they arent stock lights, then it could be any size since they are aftermarket. Pull em and see.

 

Stock ones are DS2 i believe