Here are a few websites that have some kind of Parilla content.
The Parilla group - The place to go for current information on Parillas and contact other Parilla collectors from around the world.
Moto Parilla UK - Mike McGarry's Parilla website already mentioned many times on this website.
Moto Parilla Italy - Parilla's official website from Italy.
Team Parilla - First Parilla website on the net back in 1999.
Parilla serial numbers - Website for Parilla serial numbers.