Replaced the headlights on my 03 Outlander several years ago, I ordered from Southwest Mitsubishi in Texas, about 1/3 of the price at the local stealer here in New Brunswick. I have dealt with Southwest several times, never came out unhappy.
The prices are several years old, but the part #'s should be good.
MN133516 Headlamp assy Right - 2003-04 1 $284.09 $284.09
MN133517 Headlamp assy Left - 2003-04 1 $284.09 $284.09
4G64 2.4 16v