Oregon 73-031 Pack of 2 Snow Thrower Skids for MTD Replaces MTD: 784-5580,784-5580-0483,784-5580-0638,784-5580-0662,784-5580-0729,784-5580-4043,784-5580-4044,784-5580-0637,784-5580-0691,784-5580-0689,784-5580-0721 and 784-5580-0665 For 2-stage snow blowers (1992 and newer) 2 slots (2-1/8") on 2-3/4" centers