1978-1988 Monte Carlo, El Camino, & Malibu (2/4dr) front seat mount floor brace. This brace fits under the left side of the driver's seat and welds to the floor brace and pan.
(SHEET METAL DISCLAIMER: No two cars are ever alike. Even though we have had very good results with this part, there is no way to guarantee that it will fit your car exactly. You may need to modify the part to fit your car just as GM did when the car was built. If you have never worked with sheet metal, you should consider consulting a professional auto body technician.)