glass plate adapter

Awhile back I found a Kodak 4A, model B, at flea market for less than the cost of 2 pizzas. If you have ever seen one, it exceeds the 4x5 format with a whopping 4 ¼ x 6 ½ negative. That's crazy. That's the good part. The bad part is two-fold: 1) I've yet to see a double sided plate holder for...