This mounts on the firewall on the inside of the vehicle
This keeps out dirt, oil, water and fumes from the engine compartment getting into the interior of the vehicle through the power brake hole in the firewall
OER Power Brake Firewall Push Rod Boot 1963-1972 Chevy/GMC Truck 1958-1964 Impala Reproduction power brake firewall pushrod boot for 1963-72 Chevrolet/GMC truck models. This mounts on the firewall on the inside of the vehicle. This keeps out dirt, oil, water and fumes from the engine compartment getting into the interior of the vehicle through the power brake hole in the firewall. Applications: 1963-1972 Truck 1958-1964 Impala/Bel Air/Biscayne