Not all propshaft (driveshaft) centre bearing rubber flexible support are the same! A softer version of that normally supplied, closer to the rubber compound & flexibility of the original Pirelli item. Customers have reported reduced propshaft (driveshaft) vibration when this has been fitted in place of the support rubber which is widely available.
 
Part Name: Propshaft (Driveshaft) Centre Bearing Rubber Flexible Support
AlfaStop Product Code: 1PS116
Original Alfa Romeo Part No: 1365.24.405
Model: 2000, 2600, Guilia 101 Series, Giulietta 750 & 101
Quantity Per Car: 1