Hmmm......why? the chrome fender braces work fine as they are just by hooking the cord underneath them. Theres a good size gap between the braces and the fender. just use bungees with plastic coating on the hooks and they won't scratch or cause any problems. Been doing it for the year i've had my bike and not a scratch and it works perfect? In fact i've been riding to work for the last month or so and when i leave it's too hot to wear the jacket i wear in the morning so i bungee it on every day. Just use the right bungee hook size and plasticized as i said (or cover them with heat shrink) and you don't need any kind of bolts/hooks.
