MowerPartsGroup Troy Bilt Horse Tiller Reversing Disc Gw-2111 Gw-1919 756-04171 3 3/4" OD: 3 3/4" Made by an OEM supplier Reversing Disc Replaces Troy-Bilt/MTD: 2111, 756-04171, GW-2111 Fits Troy Bilt 1989 and Newer