You are looking at the dark red back seat from a 68 Cougar coupe. Will fit 67 to 68 Cougar. Some say it fits Mustang coupe but I think there is fit issues. I’m pretty sure this is Cougar only. The base has to frame rot (pictured). This could be easily repaired by welding in some small angle iron. The springs look fine. Needs new seat covers and padding. A good core to re-upholster.