Is this type of material appropriate for an external application?
Acrylonitrile-butadiene-styrene (or ABS) is a sturdy grade of injection molding plastic resin. Molded ABS parts receive chrome plating well and are suitable for outdoor exposure. However, it will fracture if struck, rather than dent or bend. So if you add those taillight bezels, try not to get in any accidents while in your car.