Thinking of getting these but having just phoned Audi for OEM ones they have said I need to buy the casing and the motor at £278 each + vat and new glass at £180 each + vat. So a cool £1076.30. I think not VAG parts do them for £260 + VAT or JBR (richa3turbo) for around £60. Does anyone know what the diferences are between the 3 casings and is this a simple swap over? Thanks in advance of any help.