Hey Roger, the Trailing Arms (TCA026) do utilize both an inner and outer bushing. The inner bushings are included with the Trailing Arms because they are physically installed in the Trailing Arm. The Outer Trailing Arm Bushings (BK006) are sold separately because they are installed in the rear spindle and not directly in the Trailing Arms. We always highly recommend upgrading that Outer Trailing Arm Bushing any time you upgrade your Trailing Arms. Without them, you're not getting the full potential out of the new Trailing Arms.
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