Stein Dinse have them Og - 5 Euros each Part Number 19768680 it s called a Glühlampenfassung
Under the Moto Guzzi Microfiche link (obviously) http://www.stein-dinse.biz/eliste/eliste_bild.php?sid=7272gb5d6f0g3c731f4g&lg=de click on part number 17.
Under the Moto Guzzi Microfiche link (obviously) http://www.stein-dinse.biz/eliste/eliste_bild.php?sid=7272gb5d6f0g3c731f4g&lg=de click on part number 17.