Limited availability, original Alfa Romeo Dunlop part, some having the Alfa Romeo sticker still on them. Current stock is the cap only, without the rubber cap seating rubber gasket. Be aware when tightening the cap onto the reservoir body that many originally failed due to over-tightening, causing the cap lid to separate from the threaded part.
 
Part Name: Brake Fluid Reservoir (Tank Or Canister) Cap, Original Dunlop
AlfaStop Product Code: 3BRG102
Original Alfa Romeo Part No: 105.14.45.050.02/02
Model: Guilia 105 Series
Quantity Per Car: 1