Also if you have an old breather that needs new guts, just chuck the breather into a lathe and cut it off the cap at the crimp. Then just glue the cap on top of another breather. I have not tried this, but would bet it would work just fine.
All close but "no cigar" The Studebaker one looks like the ticket but I would like to see what it looks like under the sticker. It sounds like 604 wants one like the original. tmm