I just ordered the lock-o-seal from Spanaflight (http://www.spanaflight.com/). They informed me of new part numbers.
Old: 200AC-6 New:800-001-6 (Lock-O-Seal)
Old: AN6227-8 New:MS28775-110
You might want to scribble them in your parts catalog on page 100
Brake Master Cylinder Part Number Update
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Brake Master Cylinder Part Number Update
--------
John Cross - LaPorte, TX (T41)
1952 170B N2363D
1949 Globe Swift N2398B
John Cross - LaPorte, TX (T41)
1952 170B N2363D
1949 Globe Swift N2398B