On both the Model T Club websites they list paint codes for 1927 Fords. However, these codes no longer work, can't be crossed, and Ditzler has been absorbed/bought/consolidated into another paint company. So, if anyone has a modern paint code for the 1927 Royal Maroon I'd be most interested. 11 years in the making, I'm now ready to paint my 27 Tudor.
Depends a bit on what kind of paint you want to use. And your local auto paint supply store.
The Ford Royal Maroon is avail as a PPG code 1011.
There is this web store that sells PPG Automotive Finishes, you could order direct. This link is their color library, go to the home page if interested in this way.