Radio-delete status isn't particularly rare, but heater-delete? C'mon! Even in Arizona, the temperature can drop below freezing in the winter. You gotta have heat! A simple metal plate covers the hole in the firewall where the heater fan motor usually fits. The two circular, black, plastic plugs seal the holes where the hot water supply and return hoses ordinarily pass into the cabin to feed the heater core. A nearly identical block-off plate was used in 1968 on the Hurst-modified Hemi Darts and Barracudas.