Leaf spring theory question

I have weighed the consequences and am going to install spacers. Now i just need to find/make them.
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When you do this it would be a good time for you to check to make sure that your frame is square. As in the mount is the same distance on the left side as it is the right side from front to rear. This is where you can adjust for any dog tracking of the car. So say one side is differant from the other side may need to add an eighth of an inch more to make things Square. Just something to check since you'll already be there.