is it just the camber that is out? if it's only one side it seems a bit strange. the geometry is so shit on sierra suspension that one part bent like tca or anti-roll bar puts the whole side out of alignment.

tca's can be had from rally design or TAS (search em on google) but imagine shipping would beexpensive to nz. maybe make your own adjustable ones by cutting and welding in a threaded bar. take a look at the ones for sale and you'll see how to do it.

is the bad side lower than the good? measure the distance from wheel rim to wheelarch.