Picked up from another site
For all owners of California with external fuel pump, I can confirm that replaced the Original petrol pump with Bosch 0580464070 BOSCH 0580464048 is a pump mounted onto Alpha compatible BMW Purchased from a Fiat car parts at a price of 85, 00 Euro.
Fuel filter for my California 1100 I.E mounts the same above-mentioned cars priced at euro 15.00 all co a saving of EUR 200.00.
Verification done by external pump Bosch 0580464070 okay on all Guzzi with external pump from 1993 to 2003.