The plug used is a plug for an iPod. They are very difficult to find, and I'm not sure how you would make one with a right angle due to the locking tabs. That being said, here is something I put in a different thread:
If you have a OBDII cable and soldering skills, head on over here:
http://www.chargeconverter.com/shop/ and make your own cable. That's what I did. Unfortunately I was too afraid to try it in my Trinity since I didn't want to wreck it even though I was 99% sure I had everything right. I just used two AA batteries and an LED to figure out which pin on the OBDII side went to which pin on the Trinity side.
I ordered a "T" and a "TN" from that site, and they seemed to be of good quality. Anything smaller than those didn't appear to have the tabs to hold it in, and that didn't seem to me like a good idea. I believe the "F" is what DS uses.