Spot light fitment to civilian turn signal brackets
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
I extracted this information from Charlie Mullendore of Antietam Classic Cycle off of the Yahoo! Loopframe_Guzzi news group. In Charlie's own words:
On my 69 Ambo with the factorypoliziafairing, there was just enough room for the stock turn signal brackets to clear the bottom of the fairing and for the reproduction Harley FLH spots to avoid the crash bars at full steering lock.
Disclaimer: I've not used a Wixom fairing on any Loop, so the following is at best a guess based on photos of bikes so equipped.
Judging from photos of a Wixom equipped Eldo, it looks like that fairing can be used with the stock signal brackets (I'm sure many were outfitted that wayback in the day). The issue then is if the spots will clear the fairing too.