U-Weld Rear Camber Kit
 

(Scans of my kit instructions. email markered out and a few wrinkles sorry)
http://i64.servimg.com/u/f64/12/44/02/09/rear_c10.jpg

http://i64.servimg.com/u/f64/12/44/02/09/rear_c11.jpg

http://i64.servimg.com/u/f64/12/44/02/09/rear_c12.jpg

http://i64.servimg.com/u/f64/12/44/02/09/rear_c13.jpg

Larger Images:
Page 01: http://i64.servimg.com/u/f64/12/44/02/09/rear_c14.jpg
Page 02: http://i64.servimg.com/u/f64/12/44/02/09/rear_c15.jpg
Page 03: http://i64.servimg.com/u/f64/12/44/02/09/rear_c16.jpg
Page 04: http://i64.servimg.com/u/f64/12/44/02/09/rear_c17.jpg

i will post up some pic's for when i eventually do this on my ride. i wont be doing this until i get the money for new bushings and other rear suspension pieces.

Caution!
in doing this your most likly to find rust, although not mentioned i would add a bit of metal to support the the clips just added to the cross member just make sure its not in the way.

I have an 86 mk2 that I use for autocrossing. The car is lowered quite already and the only thing that is keeping me from going lower is that if I have too much negative camber, my slicks are going to wear out way too fast. Does anyone know where I can buy this kit from?

im just not too sure sorry.
i purchased it months ago i think...
pretty sure there was an add up from some guy selling a box of his old supra stuff.
got a brand new leather boot for the standard mk2 and some pieces of headlight trim and that little kit with instructions. im sure it wouldnt be that bad to make your own kit like this.