Ummm, 3.5mm is 3.5mm. The iPod connector is 2.5mm.
Given, but I'm looking to find out the length of the metal end going into the stereo, sure they are 3.5mm, but as per the harness picture Dr. Droid posted above, the end looked slighly longer than my jack for my headphones that I have, which is also 3.5mm. Plus, websites that I've seen that list a 3.5mm jack or a 3.5mm mini jack look different in the picture posted for the metal jack end (otherwise, why would a website state 3.5mm, then others state 3.5mm mini? I would assume there would be a slight difference.
Guess I found my answer here for my 2008 Pontiac G6 radio:
Adapters - 2003+ GM Radio iPod Interface +Aux Input: Axxess AIP-GM01-ID
"This BRAND NEW Axxess AIP-GM01-ID iPod interface plus auxiliary input adapter allows you to interface an iPod and/or external audio source with your factory radio. On one end, it plugs into the auxiliary input on the back of your factory radio and, on the other, it provides an iPod docking connection AND a stereo mini jack. Use this device to add an iPod AND a non-factory CD changer, an MP3 player, CD changer, satellite radio, DVD audio, etc. Or just connect the iPod and leave the stereo mini jack empty for future use... A direct connection is FAR superior to the sound quality you get using an RF modulator OR cassette adapter device. The iPod connector is licensed by Apple and it DOES charge the iPod while connected. A 1/8" (3.5mm) stereo mini jack is utilized for true stereo sound. Plug it right into the headphone jack of any device for true convenience! This device also has a video output RCA jack that would allow you to plug it into your video system and watch video from your video iPod on your vehicle's LCD screen (if so equipped and if your vehicle has a yellow female RCA jack to use for this purpose.)"
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