yes, you can put in the '99 style projector lamps on any 3rd gen. here's a link to burtman industries but you can find these lights many places, including a junkyard if you want 'em cheap and dont mind getting used ones
I replaced the headlights on my '97 with the new multireflector style. The whole process took maybe 45 minutes. I ordered mine new from www.toyotaparts4u.com. Big improvement on looks! Other than removing the center grill, it is just a matter of taking off a few bolts.