The only way to get any significant amount of camber adjustment in the MKII MR2 (short of expensive camber plates) is to replace the knuckle to strut bolts with 'crash' bolts. These are Toyota parts that have smaller center sections to allow for more camber.
Sold in pairs - if you want to replace all 4 bolts in the front, order 2 sets. Includes bolt and nut (as pictured).
Available in 3 diameters - The smaller the diameter, the more camber you will get.