AIR FILTER COMPATIBLE WITH: BRUSH CUTTER MODELS: FS 87 90 FS 90R FS 100 FS 100R 100RX FS 110 FS 110R FS 130 FS 130R FS 130T FS 310 FT 100 78X67X13 STIHL 046584 Original code: 41801201800 ALSO COMPATIBLE WITH: STIHL HEDGE TRIMMER MODELS: HL 90K