part numer = country of origin
 

is it possible to determain the country of origin of a part if you use the part number
or which countries it is used in??

I'm not totally sure if you're talking about the countries where a part is used or the exact country in which it was manufactured.

It's usually not possible to determine the country in which a Protege part is used from just the part number. Mazda part numbers often have prefixes that denote the chassis or engine code, which allows you to narrow the part down if a unique chassis or engine was only used in specific countries. However, on the Protege, the same chassis code is used worldwide, and most engines are sold in multiple countries as well, so the prefixes don't tell you much.

If you're asking about the exact country of manufacture, it is not possible. Most Mazda parts have multiple suppliers who make the parts all over the world. Welcome to the global economy. :D