Replacement Seat Box Frame For Sofas, Chairs and other Seating. This varies on a standard Seat Box Frame with Added Coil Springs For Smooth Comfortable Support. These Do Vary on Width so Please Measure Carefully Before Ordering. Width is 26.68 Inches. Depth From Front of Seat to Back of Seat is 26.5 Inches. Contact Customer Service For Additional Information and Bulk Pricing.