UPR Products Upper Torque Box and Floor Pan re-enforcement kit will make your 79-04 Mustang Rear Suspension Bullet Proof. Giving your Mustangs Suspension the Strength and Consistency you need to Run with the Best. Whether youre running 7 second ETs in the ¼ mile, road racing, or just driving It like you stole it. UPRs Upper Torque Box and Floor pan Upgrade Package will Eliminate or Repair any Torque Box Problems. Exclusive Process and Material: Made from 11 Gauge Grade 50 High Strength Marine Steel, Laser Cut for Precision Fit and Finish. Upper Kit Includes: 2pc. Upper re-enforcement Plates, 2pc. Upper re-enforcement Boxes, 24pc. Upper Hardware Kit (Grade 8).