Genuine, OEM Replacement Part Replacement guard, part number N581423 Compatible with: CMCST900D1, CMCST900D1, CMCST900B Measures approximately 13.50 X 8.25 X 2.00 inches Replacement for Craftsman OEM part# N581423. Compatible with: CMCST900D1, CMCST900D1, CMCST900B