Master cylinder kit

I have a 1988 Ford Thunderbird Turbo Coupe  What I really need is the O ring between the master cylinder and proportioning valve or as the shop calls it the   ABS.  I separated this looking for my problem which blew the by pass between the booster and the brake reservoir and ended the problem was cause by the sensor  I needed the O ring between the ABS and the master cylinder.  The shop asked my to look for a master cylinder kit     I am looking where I can find this kit  e mail below
John Bartron
[email protected]

I have a 1988 Ford Thunderbird Turbo Coupe  What I really need is the O ring between the master cylinder and proportioning valve or as the shop calls it the   ABS.  I separated this looking for my problem which blew the by pass between the booster and the brake reservoir and ended the problem was cause by the sensor  I needed the O ring between the ABS and the master cylinder.  The shop asked my to look for a master cylinder kit     I am looking where I can find this kit  e mail below
John Bartron
[email protected]

John: if it's just the o-ring, you can buy an EPDM rubber replacement online.  From my research, EPDM is the polymer preferred for brake fluid.  I got one for my accumulator from these guys: The O-Ring Store LLC, We make getting O-Rings easy! (theoringstore.com).  

I don't know about a MC rebuild kit.

I have a 1988 Ford Thunderbird Turbo Coupe  What I really need is the O ring between the master cylinder and proportioning valve or as the shop calls it the   ABS.  I separated this looking for my problem which blew the by pass between the booster and the brake reservoir and ended the problem was cause by the sensor  I needed the O ring between the ABS and the master cylinder.  The shop asked my to look for a master cylinder kit     I am looking where I can find this kit  e mail below
John Bartron
[email protected]

John: if it's just the o-ring, you can buy an EPDM rubber replacement online.  From my research, EPDM is the polymer preferred for brake fluid.  I got one for my accumulator from these guys: The O-Ring Store LLC, We make getting O-Rings easy! (theoringstore.com).  

I don't know about a MC rebuild kit.

The mechanic was showing me another o ring at the end connecting the booster  Is there someone I can talk to or how do I get the sizes  I would buy a master cylinder if I could find one available  Seems ABS no availability  Non ABS over stocked  thank you

Thank you  I gave the info to yhe shop