Rear Brake MC, KZ750E1, 1980 4 Banger

This has become a nightmare. Three "kits" later I still don't have the proper piston assemble. It's too long to work properly in that cylinder.
Does anyone have a photo of their KZ750E1 rear brake master cylinder. I've begun to think this has been hybridized.

Can you post a photo of your master cylinder and the part numbers of the piston kits?

In the diagrams there are 2 mc part numbers for the E1 and another for the E2-E3, but I did not check to see if they use the same piston or not.

It's almost impossible to get a decent photo with the MC on the bike but until someone comes along with pics of their rebuild this is the best I can get you
Bike is 1980 KZ750E1 and the MC is original as far as I know.

All you really need are the rubber seals and maybe the outside dust shield. Maybe recycle the inner piston and put a new seal on? Before going forward please check the master bore for pitting though. Water in the fluid often damaged the aluminum in which case it's a waste of time trying to rebuild.