I had same problem with RR door. The regulator cable was damaged . I got part here at Fastline. Don't forget 5 rivets. I used the riveter from Harborfreight:
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=41291
This is POS tool, but it did the job and the price was right - $12.99. Overnight shipping was more.