BRAND NEW GENUINE Stihl hardware kit, part number: 4004 007 1000 (40040071000), 

Kit contains part #'s 
1x - 9210-260-1400 - Nut
1x - 4130 713 1501 - Thrust Plate
1x - 4130 896 7800 - Pin 
1x - Instruction sheet

This item is required for use when installing the Poly Cut 5-3 head (and maybe others) on the following FS-series trimmers models: FS 36, FS 40 (OLD 4130-series models; NOT newer 4144-series models), FS 72, FS 75, FSB-KM, and FE 55

Please see your dealer for specific fitment questions, and verify that this is the part number you need for your specific trimmer/application BEFORE purchasing.

(SB-22)