It looks like someone cut off part of the mounting bracket. On the 76 I had, the same bracket had 2 holes and the coil was mounted there. I'm not sure if that's where it originally was mounted from the factory though.
My '78 model has that bracket with the coil mounted on it. I replaced the fender with one from BJ and had to drill out the spot welds on the old fender and weld the bracket onto the replacement fender.