Those aren't actually supposed to come apart - at least not easily. From the looks of the rust on the down pipes, you're going to need a complete exhaust. The mufflers aren't available as a separate part number, neither is the support bracket and hardware. Ask around the forum. There are always people looking to try to make their bike sound like a Harley by swapping the exhaust for something obnoxious. They are usually only happy to get rid of the stock pipes, rather than have them cluttering up their garage.