DOP8025 Stihl MS290 Handle Interlock Cover No. 1123-791-0600. This plastic molding for the handle also fits the Stihl 021, 023, 025, MS210, MS230, MS250, MS290, MS390, 029, 039, and MS310 Stihl Chainsaws. Replaces part number 1123-791-0600 and 1123 791 0600.