Product Description DMT insulation backing on 62-70 B body AC heater boxes. Insulates between heater / AC box and firewall. NOTE: This piece is already included in the AC heater box rebuild kit. 1966 66 1967 67 1968 68 1969 69 1970 70 Belvedere, Charger, Coronet, GTX, Roadrunner, Satellite AC heater boxes Materials3/4" matte faced yellow fiberglass insulation. Exact same shape as OEM ShippingFirst Class Mail. We combine shipping.