Genuine Girling New Old Stock (N.O.S.). By convention, left & right are as viewed when sitting in a car & looking forward. Note that the photo shown is generic, showing the main features of this item.
 
Part Name: Cylinder, Left
AlfaStop Product Code: 4BRR101
Original Alfa Romeo Part No: 1356.53.724
Model: 1900, 2000, 2600, Guilia 101 Series, Guilia 105 Series, Giulietta 750 & 101
Quantity Per Car: 1