1985 Ford Mustang location of ECA

1985 Ford Mustang mileage: 115,056. What is the location of the ECA? Haynes book says on the left side of the steering column, gives no description of color or size and not specific for this exact car. Advance Auto says it is a silver box somewhere on the driver’s side. Other mechanics I have talked to say it is somewhere on the passenger side with unknown description. This car was manufactured 10/85. Where is it and what size, color, and shape is it?There is no silver box on the left side of the steering column.I do know that the ECA wiring goes into the firewall at the passenger side. How do I get to it?