There were a couple of questions in another thread about how/when to install the front bike fender mounts. The mounts should be installed when installing the spindles. If you have installed the hubs already, you've gone too far.

Now another potential question will be "do the fenders bolt to the mount with the mount inside or outside of the fender?" Mount them as your wheel backspacing dictates. In my case, I first installed as shown in the pictures, mount on the outside of the fender. I have the FFR HR wheels and found out that didn't work too well. So, I changed to the mount on the inside of the fender, much better.

I hope that the pictures help.

Olli