Rear brake disc replacement
Moto Guzzi Quota 1000 and Quota 1100 ES models
Thanks to Nick Devinck who posted this information on the old Yahoo! Guzzi_Quota news group. In Nick's own words:
I just purchased a rear disc and its cost is 250 euros. It is made by BRAKING and knowing that now I am sure it should be possible to pay less purchasing directly from an accessory store to avoid Guzzi royalty. Maybe it will end up to be the same but worth trying anyway. The reference stamped on the disc is MGO 3RL.