I just purchased this Pioneer unit for my '03 SE:http://www.pioneerelectronics.com/PUSA/Car/CD-Receivers/DEH-P7400HD

I also have this coming as well:http://www.metraonline.com/part/99-7417
Curious as to whether the stock wiring harness that connects to the old Rock Fos unit will mate up with the new unit? There's also plug-in points on the back of the new Pioneer unit for steering wheel stereo controls and for the antenna.
Will I need to purchase any other adapters for this particular install?
Thanks in advance for any help!