Interchangeable parts?
 

I have a 1991 Mercury Tracer LTS and It is in need of TLC I was just wondering what car models/years (such as Protege and escort) have parts that are interchangeable with mine. Your input will be extremely helpful. The first thing that I will be looking to fix is the interior panel above the drivers door as it is cracked all the way through in two places. This is my first car and I know nothing whatsoever about cars so laymans terms would be helpful. Thanks a ton!