Anyone out there happen to know the part # for the flywheel to put a RS2 20V into an 1981 Euro Ur Quattro, Is it the same as the 20V Ur Quattro ??? is the 20V Urq a dual mass like the S4?? Any info appreciated We are just waiting for the motor to arrive to start the project. Should be here by the end of the month. Thanks Aidan