For the Moto Guzzi MGS-01 Corsa (1225cc): Two bearings are required for the front wheel and two for the rear wheel. Koyo: 6005DDU, 6005-2RS-...
Koyo 6006DDU. Double sided rubber sealed. Outer diameter 55mm. Inner diameter 30mm. Width 13mm. Made in Japan.
Koyo 6206DDU. Double sided rubber sealed. Outer diameter 62mm. Inner diameter 30mm. Width 16mm. Made in Japan.