MTD Flat Idler - 280-438 - Replaces 756-0437 / 956-0437 / 756-0643A / 96297 280-438 MTD Replacement Flat Idler Replaces (OEM) MTD 756-0437, 756-0643A, 956-0437, 96297 Fits a variety of MTD models Inside diameter: 3/8"; Outside diameter: 4"; Height: 1 3/16" Flat idler is made with steel material