Computer problem
1998 BMW 850 V12 Two Wheel Drive Automatic 100000 miles

I NEED YOUR ADVICE TO KNOW WHERE BUY THE 2 COMPUTERS OF THE ENGINE AND THE COMPUTER OF TRANSMISSION OF THE BMW 850 CI TIBURON. I WANT SOME PLACE IN MEXICO CITY OR IN THE COUNTRY OF MEXICO OR SOME PLACE MAYBE IN THE USA, I DONT KNOW, SOME PLACE TO GET THEM, IF IS NECCESARY IMPORT THEM I DONT CARE, BUT I NEED THE BEST PRICE THAT YOU CAN GIVE ME. THANK YOU FOR YOUR ATENTION IN ADVANCE.