3rd gen parts are very hard to come by, Try original Parts group, they have a good assortment of Malibu/Monte/El Camino that will interchange. also I beieve a lot of 4th gen parts will work as well.
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There is no such thing as Too Many Montes Member of the Motley Cruisers Car Club
my car is all gutted out with a rollcage. and i'll be restoring it little by little but i will be needing a new dashboard, door panels. its a track car but i want to make it streetable at least in the interior department, and ill need a few headlights pieces