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J4F Brake Master Cylinder help

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av8ator1

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Working our way thru restoring a J4F. We get to the brakes and it still has the original expander type with two master cylinders.
The master cylinders are 1" and have "WAGNER ELECTRIC COMPANY" stamped on them.
Any help where we can get parts to restore these units would be appreciated.

Was told NAPA has the kits to rebuilt them but that's proving to find a needle in a haystack.
 

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