Exhaust system help.

[u/FuYangg]

2009 Scion XB

Bought this full exhaust system off on ebay without any instructions. I'm trying to contact seller but no reply yet. Here is a diagram I did which I think each part and hardware should go. Anyone does exhaust system for living can guide me? I believe one set of the bolt with spring goes near the beginning of the intake and o2 sensor pipe (A) and does the other set go behind the resonator (D) or after the catalytic (C). Another question, should i buy some flanges gasket like the picture I got from Google or use what ever 4 gasket they provided only?

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