On my LBZ (drivers side) top of the radiator towards firewall there is an electrical box about 4 3/4 X 6" with wires coming out of the bottom. This box shell is alluminum with cooling prongs out the back and a plastic card with holes attached to the cooling prong side. The card looks like it could come off or should have been taken off (flimsy). What is it and should I discard the flimsy plastic card?