I have searched already and have not found an answer I can use for my '94 SS. I am installing an amp and cannot find a grommet on the battery side to put my power cable through. The harness is packed; the antenna cable grommet only holds one; and I cannot find another. I thought about drilling, but where? I did find a hose nipple ( I think ) that was unused and big enough but where does it go? Help.....