The original metal clutch master cylinder replacement is now supplied in a modern design with plastic see-through reservoir. This is the U.K-made version of this cylinder, not to be confused with the aftermarket Italian-made version. Cap is included. Ref: GMC1008, LM13106, 21A2063, AAU4969.
It is a good idea to also replace the hard-to-reach clevis pin that connects the master cylinder to the pedal, order CLZ0512
Please note that if you have already replaced your brake master cylinder with the modern plastic-tank version, this clutch cylinder will be identical in appearance to the brake master cylinder for a "matched pair" look.
For original metal tank version see AAU4969-OE.