The part GB/T6170-M4 is available for purchase and is in stock
Ships from Sweden next business day and should be with you within a week
4 pieces "nut, hexagon m4 GB/T6170-M4" are being used on the page "F4/F5 fuel" They are sold one by one, if you need a complete set you need to buy multiple.
Nut, hexagon m4 GB/T6170-M4 can be found as number 13 on the exploded view below
This nut, hexagon m4 is used for all these parsun models