New, never bolted up MBM MC5621 master cylinder listed for 1960-74 A,B,E bodies power disc/drum applications. 1.125" bore. Internal residual valve. No mounting studs or dust boot. Came from TheRamMan, he sells them for $145. $75.00 shipping included in a USPS medium flat rate box if using friends and family, or $78.00 if you don't feel comfortable with that.
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