I think like stated under the dog house toward the Left wheel on the firewall or just in front of the left wheel inboard. Use to be some pictures on here somewhere.
https://www.google.com/search?q=1996+obd1+connector+F53+chassis&client=firefox-b-1-d&tbm=isch&source=iu&ictx=1&fir=cWY6CzKvXHYktM%252ClAM1ja74UHVeAM%252C_&vet=1&usg=AI4_-kS3N0KFLVvp9ASIOsElG-GqKiNsLw&sa=X&ved=2ahUKEwii8f-QlP7uAhWdAZ0JHXbmD0UQ9QF6BAgdEAE#imgrc=cWY6CzKvXHYktM
just info. this is not the same shape as the obd11 connector. Only has 3 to 5 pins . this has pictures where it is located
