1968-72 Firewall Plastic Downshift Cable Hole Plug. This plug was used on cars with Turbo 400 or manual transmission. It goes below the throttle cable hole. All firewalls have the hole. GM made the plug to fill the hole when cars did not use a kick down cable. This little plastic plug is commonly missing. Perfect for your concourse restoration on Cutlass / 442 / W30 / W31 / Ralley 350 / Chevelle / GTO / Skylark / GS models.