Audi #447-907-404AA. Bosch #0 261 200 451. Used unit purchased from Shokan 9/14/04. Mechanic working on the car misdiagnosed a timing belt problem as a bad ECU. No returns on electrical items. Don't know what other 20v models that might fit? See it on E-bay #7965113474. I paid $645. Will be selling to highest bidder.