Worst case is you have to put a coil in. Try running a tap in the hole and see if the bolt holds tight. If not, then just run out to an auto parts store and pick up the a pack of coils only. It will list what size drill and tap you need to put the coil in. Shit, no more than an $10 fix if you have the bit and tap. There's plenty of meat around that boss to drill and tap for a coil.