There was an option for an underhood tool box, also called a Storage Compartment (Tool Box) by Ford. But, as shown in the part numbers, it was not compatible with an aux battery as they sat in the same location. Here are a couple of pictures of one I have. As you can see, it mounts to the fender where the coolant recovery/windshield washer bottle normally mounts, and the bracket shown in the picture on the left then mounts to the inside edge of the tool box and the coolant recovery/windshield washer bottle mounts to that. So, if you find one in a salvage be sure to get the bracket as well.