Moss or VB probably have them. They have just the visors, or the kit which includes the mounts and the clips to hold them in place. When you find the part number(s) send a message to Tony Barnhil, the Autoist. He's a really good guy to get to know to get parts from.
By the way, welcome to the forum! You've tapped into one of the best places I've ever known for spridgets. Many of the experts on here have helped me get my car back on the road through their advice.