By the way, I've seen these as early (bright polished) editions, and the matte finish late models, on Corvettes, plus the 18" blades on Mopars. They may be aftermarket, but I've seen a lot of pairs sell for large prices, plus even Classic has them advertised in the catalog as repops. Coincidental, I'm sure.
The "aero" wing blades were never used on Corvettes, either; both Anco and Trico blades were used (in pairs) on '63-'67 Corvettes, but only in the normal (non-"aero") configuration. Vendors will tell you anything to sell you parts, and I'm sure more than one has tried to sell "high-performance cars got hiigh-performance wiper blades from the factory". :-(