David, these are called "Caster Correction Wedges". Try any 4x4 parts supplier that fits lifted leaf spring suspensions to full size trucks. They are usually only required when a standard truck if lifted over 4"- 6", but are useful to correct wheel alignment on unmodified vehicles when there is no caster adjustment in the front axle. You may be better to have your truck up and running and take it into a wheel alignment shop so they can give you a proper reading of what the caster angle is, and what degree of adjustment would be required. Just mention your spring width when ordering.
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