I’m getting ready to put my truck back together, and was wondering on the camber adjustment 2 of mine have this plastic insert. Do I still need to use that and where does it go front or back of the control arm. The truck is an 2002 2500hd. Thanks

http://i232.photobucket.com/albums/ee181/hk45t/IMG_3323.jpg
http://i232.photobucket.com/albums/ee181/hk45t/IMG_3324.jpg
http://i232.photobucket.com/albums/ee181/hk45t/IMG_3325.jpg