O-ring for sealing the clutch push-rod to the transmission input shaft
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
Thanks to Dan Eberhardt for encouraging me to add this information now that Moto International is out of business.
The size of this O-ring is 5.8 mm ID × 1.9 mm wide (JIS P6). Buna-N work just fine. Make sure to purchase an that is sufficiently soft...something with a Shore Durometer (A Scale) = 70 is great. You'll need 6 of these o-rings. Read the installation instructions
Dan Eberhardt reports that the following sizes work well. Thanks to Dan for sending me this information in a private communication.