This is genuine Stihl Filter Cover p/n 4137 141 0500, which fits the FH 75, FC 85, BG 75, HT 70, HT 75, FS 75, FS 80, FS 80 R, FS 85, FS 85 R, FS 85 T, FS 85 RX, SP 85, SP 85 K, KA 85 R, HL 75, HL 75 K, HS 75, HS 80, HS 85, KW 85, SP 81, KR 85, FC 75, KM 85, KM 85 R, SP 80, SP 80 K, FR 85 T, FR 85 & many other machines. If you are unsure whether this is the correct part for your machine, please fill out our online parts enquiry form here. The technical department will then respond to confirm whether or not it is the correct part for your machine.