Correct master cylinder

[Shoooter]

What is the correct master cylinder for a 71 cuda 340, disc brake and drum car? I bought these for the booster and just seeing if they are correct . I could have them rebuilt if they are. If so who offered a rebuild kit for a booster and master cylinder

[Cuda Cody]

Is there s number on the bottom of them?

[Shoooter]

There hard to see. I'll see if they show up in a picture

[Shoooter]

I dont think they are original

[JH27N0B]

3461187 is the correct casting number for disc brake E bodies in '71 except for hemis.
I'm pretty sure there is a kit still available from aftermarket sources.  Check Rock Auto.
Otherwise, send it up to Brake and Equipment Warehouse in MN to be rebuilt and sleeve the bore.

[Shoooter]

That's awesome! Do they sell a rebuild kit do the booster as well?

[headejm]

I hope this chart can answer your question. 

[JH27N0B]

That's awesome! Do they sell a rebuild kit do the booster as well?

I've never looked into rebuilding a booster before.  I've used Booster Dewey.