De-pressed the clutch pedal to change gear and there was a crack like sound and a small white piece of nylon plastic dropped down.

Pedal still works fine but makes a little 'creak noise'.
Bit of exploration under the pedals and the white bits are part of the clutch pedal return spring - not the master cylinder. This picture shows the yellow return spring at the base should be the complete round white bit but obviously its broken.
Any ideas on a part number and how to replace!?
.

Pedal still works fine but makes a little 'creak noise'.
Bit of exploration under the pedals and the white bits are part of the clutch pedal return spring - not the master cylinder. This picture shows the yellow return spring at the base should be the complete round white bit but obviously its broken.
Any ideas on a part number and how to replace!?
.
