W123 Replacing Muffler & resonator ,what do I need?

I bought a center muffler(resonator) and rear muffler and soon it's going to be coming in the mail. What else am I going to need?
Muffer Donuts, #, hangers?
I *am* buying 8 donuts, like these http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=42610&item=2439731519
Same link
but am wondering what else I will need.
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