AIR FILTER COMPATIBLE WITH : STIHL blower: BG 75 STIHL brush cutter: FR 85, FR 85 T, FS 75, FS 80, FS 85 FS 85 R, FS 85 RX, FS 85T, KM 85 STIHL hedge trimmers: HL 75, HL 75 K, HS 75, HS 80, HS 85 STIHL pruner: HT 70, HT 75 STIHL sweeper: KW 85 STIHL lawn mower: FC 75, FC 85, FH 75 Height in mm: 5.50 Air Filter Design: Flat Width in mm: 61.00 Length in mm: 61.00 PART NUMBER: 176-921 ORIGINAL CODE: STIHL 4137 124 2800 CZ