ID these Heads

[neilp]

I am going through some early flathead parts I bought and found this pair of 21 stud heads. Both have Ford script and have casting dates of Nov 38 and July 39. I figure they are replacement heads from the casting dates. My question is what do they fit? Are they for a specific year or generic 34-36? I have no use for them and would like to move them along and be able to accurately describe them. Plese tell me what you think.

thank you
PML