Just arrived in the mail this morning!... I could have done with this years ago...
This confirms the C55 uses the 208.374 centre muffler, but ironically the A202# rear muffler does not show up in EPC =) .
The Sub frame is A202# and does not show up either but I'd bet its a clk55 sub frame... All other parts seem to be related to 208 CLK55 except that funny A208# air-air trans cooler?...which again doesn't show up in EPC..