1958 Ford Fairlane Spring Model?

[mercman from oz]

I have pictures of 2 distinct 1958 Ford Fairlanes in my Brochure collection with variation in the side trim. One is of the regular issue Ford Fairlane, which was the more economical model in the Fairlane range for 1958. The second set of illustrations shows an added "insert" on the front fenders extending into the doors. Was this addition to boost sales? I know that the more expensive Fairlane 500 are frequently seen, but the plain Fairlanes seem to be fairly thin on the ground. So, how many of these Fairlanes with the updated side trim are still around, as I have never even seen one in a picture, let alone in real life?
Are Ford Barners aware of these variations in the side trim on these cars?