we did this on another board. i just recently completely aligned my car, correcting camber both front and rear. for the rear, i used new bolts and washers. the specs for the bolts are M10, 1.25 pitch x 60 mm. make sure they're metric grade 9.10 (it's equivalent to sae grade 8). i used 4 washers on each, and it corrected my camber a little over 1°. it started out -2.15° or something, and the tech said it corrected to make the rear barely over one degree out, so say -1.1°. and before i put the washers on, i tightened the bolts down to see if they'd bottom out in the chassis before becoming tight. they worked fine without the washers on, so they definitely had room.