Wa-alaykum us salam Jamal Bhai, there are big markets of used JDM parts in Karachi, probably biggest in entire Pakistan, but I have moved from Karachi to Hyderabad for job purpose. I would have surely helped you out had I been staying in Karachi these days. You may seek help from @sarkaar bhai, as he permanently resides in Karachi, and may well be able to lend you a helping hand in this regard, In shaa Allaah