Thanks Kevin, I'll have to get busy googling. I haven't seen those at the usual suspects like Antique Electronics, Percy or Parts Connexion.
I'm sorry, but in my mind duct tape is a far worse solution than hot glue. I'm sure it's fine for insulation between the caps but as a permanent or even semi permanent mount no way. If I'm going to do something other than hot glue I want a solid mechanical connection, not adhesive.