Disc brake line bolt size
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
Thanks to Charlie Mullendore of Antietam Classic Cycle for providing this information on the Yahoo! Loopframe_Guzzi news group. In Charlie's own words:
When I added the second disc to Cam's Eldo, all of the banjo bolts were 10 mm × 1 mm. The port on the junction block for the brake switch is 10 mm × 1.25 mm, though. Every Tonti Guzzi I've worked on has been 10 mm × 1 mm.