There is a C/F mudguard on ebay, from a manufacturer in san diego. It looks good and who would know it isnt original!!!. But i have seen originals on ebay quite regularly,Or have you tried reboot guzzi spares they are/werebreaking a cafe sport so they may still have the mudguard.
Gary
I bought one of those fenders from that guy in San Diego .He lost my order or some excuse and kept my payment for weeks.When I emailed him he was apologetic made excuses and after another couple of weeks sent something that looked like crap from a bent mold or something.I wouldn't put on my bike and gave it to a friend to give someone for a track bike.Very disappointed!!check his feedback.Maybe he should stick to car parts.