Yep.
I just did this to fit front fenders to a couple of Thorn forks. Works well. Be sure to use a washer above and below and use a nut one size larger as a spacer if you need it. A drop of Loctite 242 (blue, medium) would not be amiss. This assumes the fenders are plastic.
If metal, then you'll need to also fit some leather washers.
You'll have two holes to choose from for placement.
Best,
Dan.