If you just need the rear muffler, then you just need the rear muffler and spring bolt kits. The donut gasket will be stuck to the end of the resonator pipe. It's a hard gasket that is reusable in most cases if you leave it on there.

You can look up your parts on hondaautomotiveparts dot com (Majestic) and either order from them for OEM stuff, or get something like a Bosal from Autozone, etc. I don't use the heat shields and I use Bosal for the center and rear exhaust (lifetime an inexpensive).