[Compatible with] Behind Seat Speaker Brackets Fits Chevrolet C10 1973-1987. [Features] Square body, speaker stand fits 6" x 9" speakers, allowing you to easily mount a pair of speakers behind the seat. [Material] Features: Made of high-quality 16-gauge steel and comes in powder-coated matte black. Excellent performance and durability. [Performance]: Built according to strict quality control standards. This is an easy way to add tons of sound to your cab. It allows sound to travel along the sides of the seat, rather than being choked by the seat. [Installation] Easy to install, install with sticky tape or bolts, easy to snap-in installation. No cutting required.