Go with the outfit affiliated with this forum.

Call 1-888-333-4642 (toll free in the US) and ask for Phil.
or e-mail philip@peachparts.com
Hours: Mon - Fri, 8:00am - 6:30pm ET

I got mine through Phil - He's a good guy.

You should get the proper part number for the harness to avoid any confusion. Its is tagged on the harness where it runs between the battery and the control modules (you may need to remove the battery to get a good look). Also, you can confirm the manufacture date of the harness on the tag as well ( < = '95 : ya probably need one).

They go for between 7 & 8 hundred .

Good luck.