Replacement Seat Box Frame For Sofas, Chairs and other Seating. This is an All Metal Seat Box with No-Sag Seat Springs, Staywire, and Clips all Pre Installed on the Seat Box Frame. This seat box has rear mounting brackets. These Do Vary on Width so Please Measure Carefully Before Ordering. Width is 23.68 Inches. Depth From Front of Seat to Back of Seat is 26.5 Inches. Contact Customer Service For Additional Information and Bulk Pricing.