What type of exhaust gasket should I use when fitting new exhaust?

I would like to install new exhaust system on my car and was wondering if I use the flat oval shape gasket or round conical gasket or both? I'll be installing a backbox and centre pipe. It's a 1998 Honda Civic.

You use the type(s) that are fitted already. The exhaust shop will sell you the correct items

Use both gaskets just to make sure it seals up properly.

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