I think those window switches are out of production. You could try the Nissan dealership, but I don't think you'll have any luck.
You could try
http://www.car-part.com to search for salvage yards with 'vert parts.. if you find one that has a convertible top motor or pump, then you might get lucky and they might still have the whole car... give them a call and see if they have some of those interior parts..
As for headlights... Do you want to keep the stock pop-ups? You can get new lenses, projectors, etc... to fit in the stock housings.. Or, you can get some of the fancy new (expensive) non flip ones that sit in the stock position. Or.. you can do a silvia front end conversion.
or.. get an EVO style bodykit and get some of those massive rally fog lights.. lol.