The location of the ring to level a 1/2 ton truck equipped with the Motofab U.C.A arm and Bilstein B8 5100 series depends on the vehicle's lift and your aims.
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Motofab's U.C.A arms are suggested for a 2 1/2 to 3 inch raise, based on reviews. You can thus put the ring on the Motofab arm in the appropriate location to lift your bike by 2 1/2 to 3 inches.