You are right Vince, they all fit no matter what the body style, as they all had the 119 inch wheelbase, wagons and all. Convt frame was definitely stiff though - my 65 Parisienne was stiff enough that I used to get a bit of shake through the whole car. Not an issue, but noticeable on a bumpy road.
I think what Vince says is right. The non ragtop frame wouldn't cause any issues in are restored convertible that's not driven every day all year round.