Not aware of any, and given their size, I doubt it.
You could make them yourself though, with 0.6 – 0.8mm styrene rod that you sand to a point, and taper a little with fine sandpaper.
Then glue on a few, thin plastic strips, for the clips, and you're good to go.
Sounds complicated, but it really isn't that difficult, with a little time and practice.
I've made 1/600th scale droptanks using this method, before, for aircraft.
Use fine, 200 – 600 grit sandpaper.
Surprised the FOW Duster doesn't come with them.
Another option would be pins/needles of the appropriate diameter, inserts into some thin, hollow, styrene tubing. That might be easier, if they are about the right size. Perhaps grinding the tips off a little, to make them more round.