For Mitsubishi parts please contact Mudassir Ali Zaidi in DEWAN Motors Karachi. I purchase all Japanese parts from him.
Contact:
0336 3411124
0301 8287531
0335 2676829
Alternatively, you can visit a website called Impex Japan (Google for link). Enter your 17 digit Vehicle Identification Number (VIN) mostly found on the heat shield in the engine bay. Enter the number in the car parts catalogue section and your entire vehicle schematics will come on display category wise such as engine, transmission, body, exterior, interior, electronics, etc. Every part down to the last screw is number and available for purchase. Even the different faces sent to different markets are mentioned there such as minor changes to bumpers and grill.
You can create your shopping cart and order the items directly to Pakistan. Cost is reasonable but I'm not sure whether you'll be charged a duty once they arrive in Pakistan.
As a start you may use my car's VIN just to see how detailed the schematics are and all.
VIN: JMYSTCS3A5U002576