Joe,
I ran into this a while back. Here's a
link from the oldcarmanualproject site. See the first paragraph.
I also found these
screws for installing the windlace on my 1947.
The windlace on a 52 slides into a welded channel, and that applies to late 49 and on up, if I'm not mistaken. That style sounds like a fight to the finish to install. Good luck!