Adjust the width of your saddle to whatever your preference is with the Henri de Rivel Adjustable Gullets Plates For Saddles. Whether you need a narrow or wide adjustment, these gullet plates have different colors for each size and are easy to replace so that your saddle is sized the way you need to fit your horse. See gullet plate measurements for a precise fit. Narrow to Wide Gullet Plate Measurements: N: 8 1/4 in.; R: 8 3/8 in.; M: 9 in.; MW: 9 3/8 in.; XW: 9 3/4 in.