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If you're in a hurry, you can opt for the cheap email Marti Report.Check for the brackets spot welded to the floor pan to receive the screws shown in the chrome inserts.
Your first picture seems like the view of the bracket I remember seeing on my car.What's attached to these L & R brackets on fixed rear seat cars?Got to be something otherwise it doesn't make sense for Ford to install them with assembly line cheapness being the order of the day.