My first advice is to join the Catalina 38 International Association. This group has amassed a wealth of knowledge about our boats. Much of it is posted on the Association Website. If You can't find it there, just ask...Someone in the group will know.
The exact measurements for the mast are posed in the Association Website technical section as are many of the original Catalina technical drawings.
As for Your question:
Chances are that LeFiell Manufacturing provided your original mast ~
http://www.lefiell.com/
fair winds,
~d