The Westco battery, model 12V20P, 275 CCA, is a perfect fit for the 2003 and 2004 Moto Guzzi California Stone.
I just thought you would like my feedback.
The dimensions are 7" long, 3" wide and 6.5" tall.
It works a treat.
Have a good day. Ed, MK battery sold me the Westco BTW, peace