Direct Sheetmetal Replacement 1930-1931 Ford Under Seat Pan for Coupe. MEASUREMENTS: 13" - FRONT TO BACK; 31-3/4" LEFT TO RIGHT ON FRONT EDGE; 34-7/8" LEFT TO RIGHT ON BACK EDGE. The Under Seat Pan is manufactured from 16 and 18 gauge cold rolled steel. It includes required mounting hardware and complete instructions. All of DSM parts are designed to make installation simple and comfortable in your home shop or garage.