Just buy some. They are cheep and save yourself the frustration. If you want to make them, get longer bolts and drill the center on a piece of 1 1/2aluminum cylinder stock at whatever length you need.
2013 Wrangler 2D, 3.6L, Automatic, 3.73 Gears, Limited slip in the rear, Teraflex 2" lift, 285/75/16 tires, LOD bumper & 8K winch, 2M Ham radio.
People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf- George Orwell