If its the same chassis ## it probably is the same.
This is when they were changing the chassis numbering scheme
from tube count to screen size for the first numbers.
Most Zenith FBT's start with an S-##### & are
marked EIA 343 so Zenith made. They are not a quick
swap so be sure first.
I bet someone has the factory manuals & can check for you.
73 Zeno
