HIPA Fuel Cap with Oil Cap for STIHL 066 MS660 Chainsaw 0000 350 0509 / 0000 350 0520 Replacement manufacturer part number: 0000 350 0509 / 0000 350 0520 Fitment models: STIHL 066 MS660 chainsaw Package include: 1 x fuel cap, 1 x oil cap