Master cylinder question? What's it fit?

brian6pac said

A picture of the piston would help, is the hole deep or shallow, what diam, are the reservoirs the same size?

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A picture of the piston???
What do you mean by that"?
I don't have any need, or desire, to disassemble the darn thing for ID purposes.
You can tell by the cap on the master cylinder that the reservoirs are the same size.