Nah I havent found the noise filter local because they are typically for RCA so you would have to spend more money to adapt it and get it to a 3.5mm jack.
Here is another pic and a link.
Looks OEM to me. I took a dremel and notched under the rubber seal that outlines the hatch so that the wire would fit into it perfectly then pressed the seal back down and ran the wire through the floor boards/carpet/ect then up the side of the arm rest and inside of it. You will just have to be creative on how you run the wire but you cant see mine at all from the inside either.
The Antenna is a magnet and the wire protector deal is 3m tape.
http://cgi.ebay.com/PAC-SNI-1-3-5-R...ryZ50552QQssPageNameZWDVWQQrdZ1QQcmdZViewItem