'91-01: conventional bulbs, 9006 low beam, 9005 high beam
'02-04: HID

For the '91-01, the headlamp assembly, which consists of the bulbs, the front lenses, and the housing - basically, everything that is underneath the garnish (the painted body panel that covers it) and fits into the bracket, lists for around $500 per side. The garnish lists for $200, the bracket (that holds the headlamp assembly) $300, and the motor $300. Again, prices are per side. You can look up part numbers here.