Installer.com has one as well and I think they have the wire harness adapter now. If you want to order every thing from that honda dealer try giving them a call or look under the accords or elaments parts? But they should have it but it might not be listed on the web.
Here is the link for the other one.
http://www.installer-data.com/item/d...php?it=40-hd10
Just looked at there wire harness, I dont think it is the correct one as it only has one plug. It might work for a civic without the factory Amp though.