43020-1024ZP Rear Master Cylinder Piston z1300, 
Made by Zed-parts this is an exact replica to the original. 
5/8 bore model. Please ensure your bike has not been fitted with the 14mm type
We have made this in grade 7076-T6 ally. 
Comes with seals and spring, new shim stop and top hat dust seal. 
Please make sure the piston bore is not worn or damaged.
 
This does not fit the KZ1300B2 or the ZN1300A1-A6.