I think of he heavy plates at the rear corners of the Chevrolet cabs (I don't know about Fords) as more common on Cab 12. The same applies to the ventilator openings. I'm not saying they can't be on a cab 11 - just not at the beginning of production.
Are those the mounting straps for a coolant recovery tank in the 3rd photo in the first post? If so, not a "beginning of production" feature.
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