Replacement Part Number for Stihl  FC 90-Z (FC 90: Drive tube assembly, Gear head) FC 73 (Drive tube assembly, Loop handle, Gear head) HT 102-Z (Drive tube assembly) FS 100 RX-Z (Drive tube assembly) FS 80 R - 4137 (Drive tube assembly FS 80, 80 R, 85, 85 R, 85 RX) FS 80 - 4137 (Drive tube assembly FS 80, 80 R, 85, 85 R, 85 RX) FCA 80.0 (Drive tube assembly, Gear head, Deflector) FC 91-Z (FC 91: Drive tube assembly, Gear head) FS 74 (FS 74: Gear head, Drive tube assembly) HT 70 Z (Drive tube assembly HT 70, 70 K) FS 110 RX-Z (Drive tube assembly FS 110 RX) HT 100 (Drive tube assembly) FC 75 (Drive tube assembly, Loop handle, Gear head) FCA 135 (Drive tube assembly, Gear head, Deflector) FC 100 (FC 100: Drive tube assembly, Gear head) FS 94 R-Z (Control handle, Drive tube assembly, Gear head from serial number 516962085)