Detroit Speed Rear Torque Box Kit - Detroit Speed Rear SuspensionThe Detroit Speed Rear Torque Box Kit is designed to add structural rigidity to your 1964. 5 1970 Mustang along with the subframe connector kit P N 010105. The rear of the connector attaches to the Detroit Speed torque boxes that come with the Mustang QUADRALink kit or the Mustang Mini Tub Kit. Ideal for use with frame connectors, QUADRALink or Mini Tub Kits Adds structural rigidity to your 1964 1970 Mustang Use with Detroit Speed Rear Suspension