Ran across an article in a Popular Mechanics from 1977 that talked about Emess coach works and how they made converts in the 70's. Thought I'd post it up but the pics aren't the best resolution. I don't own a scanner so these are pics of the pages in the book. Hope the print is somewhat legible. Here's a pic of one of the Cordoba converts they did back in the day. The cars suffer from the same issue most converts do, they look good with the top down but aren't very pretty with the top up. Here's a one of the Mustang II's that they mention converting in the article. This one belongs to a friend of mine and is being restored now.
The author of this article said Lincoln didn't make a convertible after 1941. He isn't a history scholar. You'd think he'd recall JFK was assassinated in a 61 Lincoln convert. Lincoln made convertibles from 1958 to 1969 with the 61-69 models being 4 doors.
I remember reading that article when it was new. One of the few that has stuck with me over the years. I just thought it sounded so cool to do to the Cordoba, the coolest car on the road at that time!