[Alex Evonosky]

Bob,
To save you a little headache, try the following. (just a sugguestion) other guys may have a better waybut:
Get your frame level.
1. Set your bottom control arm at 0 degrees (level) Both sides.
2. Mount your rack loosely, plenty of room to raise it up.
3. Set up your laser level up and adjust the rack and ends so the red line runs thru the center of the rack and out to the rod ends.
4. After the rack and ends are level, measure the height between the bracket and bottom mounting plate of the rack.
Cut the spacers that length.
That should get you real close if you are concerned about bump steer.

Sounds a little long but real simple.
I basically used the laser level and a digital 90.00 level to set my whole frame and front suspension up.

Hope this helps.