Lefty, I faced the same issue you are. I could not find a source to buy the "wind Lace" for around the doors on my 30 coupe.
I finally went to a local lady who reupholsters nearly everything. We looked through her material samples and found a very good match color wise to my seat and door panels. I then got some poster board to go in the tail that tucks behind the various panels. I folded the material around some 3/8" nylon rope and had sewed it so as to form the bead. I then used spray adhesive to bond the poster board to the tail. It was then just a matter of removing the necessary panels and slipping the tail under the panel and reattaching. I did use a little spray adhesive on the tail that went under the panels to help hold everything in place. It was really pretty easy and looks as it should. Hope this helps.