Spectra Premium 94571 Heater Core for Ford Mustang/Thunderbird Innovative engineering, manufacturing technology and quality control ensure that Spectra Premium heaters meet or exceed the performance of the original equipment heaters they replace Designed for exact fit in the vehicle's original equipment heater casing All heaters are 100 per cent leak tested 100 per cent new, OE style Only the highest grades of materials are used in our production to ensure product longevity