?location of ECM for 89 Park Ave

I own a 1989 Park Avenue/3800 engine, with 138,000 miles. Does anyone know the REAL location of the ECM. I have been told it's the roof of the glove box, under the glove box, in the right kick panel, under the dashboard on the passenger side, in the engine compartment-passenger side by the windshield. Does anyone know where the actual location is???? Going nuts looking!!!!!! Thanks!