Late 1931 Ford Pickup Roof -Need Help

[Brian Fella]

Hopefully somebody can help. I am rebuilding a late 31 Ford A pickup with the steel top. I am replacing the back cab panel and do not know what should be used to cover the seam between the actual steel top and the back panel. Is it a metal strip with a rubber type seal behind it? I have attached a picture of what it should look like and hoping someone can offer some direction as to what should go back and possibly what I can use or buy to finish this cab. Thanks everyone!