Sorry, my bad, didnt think Orion had home audio products. You'll need the adapter if you plan on using the factory speaker wires, so if you arent planning on routing wires through your doors then yes you'll need the harness.

2000 SVT Contour #1077/2150 MSDS Headers/B&M Shifter/H&R's/

1995 Contour SE V6 #????/Tons KnuProject, awaiting mass mods