Type 1 ('78~86) has a 2-screw notched strike for a teter-bar catch, a J-bolt mount, an UNreinforced arm, & straight body brackets.
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Type 3 (~'90~96) has a 3-screw bolt strike for a remote-controlled catch, a 3-lug mount, the arm reinforcement is 2 separate tubes, & round body brackets.
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To prevent the carrier buckling the quarter panel, add a tether & reinforcements:
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Owner caption July 2007 · Photo 1877 of 5000