This master cylinder piston (plunger) is unusual in that it is a 2-piece assembly, as shown in the photos. Manufactured in England by a long established supplier to Girling and AP Racing. Equivalent in quality to the original Girling item. The piston is case hardened to a depth of 0.010" and then centreless ground. This item is NOT offered as being suitable for the various un-branded reproduction master cylinders currently available on the market.
 
Part Name: 0.75 Inch Girling Master Cylinder Piston (Plunger)
AlfaStop Product Code: 2BRM103
Original Alfa Romeo Part No: 101.26.45.020.00/07
Model: Guilia 101 Series
Quantity Per Car: 1