I have some VO noir 63mm fenders for my non-Riv custom, to cover Fleecer ridge tire.
Unfortunately, the fenders are still in their (quite nice) packaging, hanging on the wall of my shed.
The fenders look great, and in the future I will figure out how to mount them with V-brakes. For my particular bike, that looks non-trivial, since the brake cross-wire would pass directly through the fender. My hypothesis is that I can just run the wire OVER the fender with a bit of helicopter tape to protect the fender. Wires go around corners all the time.
I haven't tested my hypothesis yet, but if you've got V brakes, you might want to visualize where the fender will intersect.
Philip
Sonoma County, Calif