Rear sway bar mount support brace are designed to increase the stiffness of the rear sway bar mounting bracket and reduce the likelihood of bending or cracking of the OE mount due to the increased loads placed upon it. The stock mount is known to bend under hard driving conditions reducing the effectiveness of your sway bar.
These support braces will be sold as a pair, and will come powder-coated a nice silver finish for extra protection against corrosion.