These are direct fit heater and A/C block off plates for 1961-1964 Cadillacs. CNC waterjet cut and made in America. Mounting holes cut to match up with original holes. Add a small bead of silicone to seal to the firewall when you install for a waterproof installation. Sold as a single for factory heater only cars or as a pair for factory A/C cars. These are priced with shipping included.