The lower and upper sets come together in a kit that y.
Mustang torque box reinforcement.
These kits feature upper and lower reinforcement panels that can be bolted in or welded in.
1979 1993 fox body mustang torque box reinforcements.
They are designed to stiffen the rear end add strength and improve the handling characteristics.
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This video contains the instructions to install the upper torque box reinforcements from upr products.