Anybody know of a good website or Mazda telephone number to call that will give you the 100% correct part by searching your car's VIN?

Unfortunately I don't have the tools myself to pull out the ECU and check for myself firsthand nor any friends that could easily help me out.

Searching Google is like pulling tooth and nail. Most sites, when you can find any that are helpful at all, aren't specific and end up asking you to select the exact part number after specifying the year, model, engine and tranny type for your car. Which is worthless since that is what I am trying to figure out myself.

Any help is deeply appreciated. Since my ECU is dying my A/C currently doesn't work!