You've selected the shim with 6 spindle studs and nuts.

If you're tires are leaning in or out, these units will make it better.  These are priced EACH!!!  If you need to do both knuckles, select a quantity of two.  The addition of a shim pushes the spindle out 0.16" (thickest point), and typically requires a longer stud.  You can measure the amount of threads sticking out beyond the existing stud to make yours will be enough.  Most OE studs won't be long enough.  There's a picture in the images depicting how far our stud protrudes from the knuckle. 

The shim allows up to 1.5 degrees of adjustment, and fine adjustments in 1/8 degree increments.  Look at the pictures and you'll see the shim has a wedge shape.  The notches shown in the pictures are used for the adjustment.  Put the notch at 12 o'clock (6 o'clock if you need the opposite direction) on the spindle, verify that notch is the degree angle change you need, and that's it.