if it uses the same nuts as the OE shock it's a M12 x 1.5 tap.
It looks to be a bit of a coarser thread though in the piccy.
The other thing you could do is neatly grind the threads off and re-tap it with the next size down.
I nearly resorted to that with my shocks but managed to re-cut the thread slowley with a hacksaw.
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