Our common 13/16" primary master cylinder seal is no longer available and the replacement is not interchangeable, this will result in AP Racing not being able to supply the repair kit CP2623-93RK any longer.

New Seal Information.
The new seal is narrower than the old requiring a new piston. Some customers may choose to buy new master cylinders which in future will be built with the new seal and new piston with geometry to suit.

For more detailed information see document below:
P14.269.