XK150 Later design, 'Quick- Fit'  bolt-on Rear Piston Caliper assembly. Four of theses piston assemblies are required for a full brake rebuild on the rear axle.

Original ref. number Jaguar : 7227 . Girling : 78465

Suits later Square brake pads,  SEE : 3450 options

4 x Special Fitting Bolts Per Cylinder USE :  3181

For a seal repair kit SEE : 3140