Hotchkis Sport Suspension 4017 Sub Frame Connectors for the 1965-70 Mustangs are designed to add rigidity to the chassis to improve vehicle performance by reducing chassis flex. Fabricated from 1 in. x 2 ft. x .095 wall rectangular steel for maximum ground clearance these TIG welded connectors are powder coated gloss black. Installation of these connectors does not require modifications or cutting of the floorboards but does require welding. Hotchkis Subframe Connectors are a must-have finishing touch for any high-performance application.