1967/1968 Shelby GT Mustangs with the wrong rear valance and tips. Those are 1967 first design tips with a second design rear valance. Midyear during 1967 production Ford changed from the single round tip and associated rear valance to the quad tips used on the Mustang GT in an effort to save money. Then all 1968 Shelby GT Mustangs used the second design.
This is the first design tips and rear valance
This is the second design tips and rear valance