I know this is a delayed response, but what I just learned (after much research) is that part #80483-06 is evidently a single '06+ "touring muffler assembly" with CAT. These are normally sold as a pair under part #80463-06, in which case they're called a "touring muffler kit".
It's also easy to confuse the various end caps for these mufflers. From what I can tell, there was an early style which used small mounting holes with a short skirt (such as #65062-01), and then a later style which uses larger mounting holes and a long skirt (#65067-01). The mufflers mentioned above use the later style. To make matters even more confusing, the early style now apparently fits some newer mufflers, and the later style doesn't seem to even be listed in the '07 P&A catalog.
Trying to explain the difference in end cap mounting styles to guys at the dealership parts department will get you plenty of blank stares, which unlike the end caps themselves, are free. That's right, $64.95 EACH. Bring your part numbers, your wallet, and some Vaseline.