(1) center - rear muffler:
the clamp is No20 and comes with the rear muffler, if not: (http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1HJ1DL3DD1L318JZGR&year=1987&make=MB&model=300-E-002&category=H&part=Muffler+Clamp).
77, 80, 83 is the rubber hanger including hardware. I'd replace the rubber doughnut (http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1HJ1DL3DD1L318JZGR&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1987&product=H8050-26058&application=000045975), the hardware can possibly be reused.
(2) cat - center muffler
You need 38 and 40. Those are two seal rings
(http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1HJ1DL3DD1L318JZGR&year=1987&make=MB&model=300-E-002&category=H&part=Exhaust+Seal+Ring). One clamp (bipartite 32, 35 is already attached to center and catalyst respectively) - I do not know how to get them on later. The other one, 39, probably must be bought from the dealership.
Good luck, Bruno

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1992 300TE 160 kmiles