I'm not aware of any steel fenders available, but AAR Quality Fiberglass makes a nice pair of glass fenders for 67-69 cudas...
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My Mopars: '69 Cuda SRT8 6.1 Hemi '78 Lil Red Express (5.7 Hemi crate waitng to go in it) '05 Ram "GoManGo" 5.7 Hemi Daytona '05 Jeep Grand Chickeree 4.7 "3 Hemis, no waiting!"