Where can I find the courtesy lights ? (The one located on the front corners of the car)

I'd check out www.car-part.com, may be part of another assembly on this vehicle, so check for cornering lights, etc. in your search.

http://www.google.com/products?btnG=Search+Products&q=76+celica+corner+light ebay of course.

i have some parts for those early celica's let me know if your interested