This sticker is self-adhesive. One of the first items stocked by AlfaStop way back in the last century.

Part Name: Fluid Reservoir (Tank Or Canister) Girling Sticker, 750 Series Giulietta & 1900 AlfaStop Product Code: 1BRG104 Original Alfa Romeo Part No:  Model: 1900, Giulietta 750 & 101 Quantity Per Car: 1