Anytime you are removing a downpipe/J-Pipe, then you know how much of a battle it can be with the hardware. Depending on the mileage and even the climate, these elements can make the factory hardware fairly stubborn to work with. And some hardware may be subjected to penetrating lubricants, they can get heated with a torch, and they could get rounded off or misplaced. Whatever the case may be, the factory Downpipe/J-Pipe nut is available for separate purchase. This is an OEM component, so save yourself some time with using a proper nut instead of trying to play the matching game at your local hardware store.