Transmission mounting spacers
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
I extracted the information about the five speed spacer dimensions from Ray Hale off of the old Topica Loopframe_Guzzi news group (which has now moved to Yahoo!).
These are the aluminum spacers that fit on either side of the transmission and through which the 12 mm engine mounting bolt is fitted.
On four speed transmissions, the left side spacer is 57 mm long and the right side spacer is 42 mm long. Both have an inside diameter of 12.2 mm and an outside diameter of 24.9 mm.
On five speed transmissions, both the left and right side spacers are 57 mm long, have an inside diameter of 12.2 mm, and an outside diameter of 24.9 mm.
If you need to craft replacements, McMaster-Carr part number 4634T23 will work well for rod stock you can cut to length and drill.