Master Brake Cylinder

[cruiserdog44]

I have taken my master brake cylinder apart and it cleaned up
nicely. However, the only problem is the rubber cups are bad and
need to be replaced.

Does anyone know where I can get a rebuild kit
reasonable, and how much?

Also, has anyone substituted a master cylinder from a newer
vehicle? Like a chevy, so parts are a little more readily
available. If so, what year, and model was used?

Thanks,

Cruiserdog