Bought a "5X7" Burke and James last month on feebay to rob the lens. It had a coated very late 159 Wolly which I've now added to the burgeoning family. Anyways when I got it, I took it and half a dozen 5X7 loads out to play with it a bit. Damn I had a hard time trying to get those 5X7 film holders into that 4X5 back. So I complained to the seller that the "5X7" I'd bought came up more than a little short. He promptly returned that it was a lucky break for me as 4X5's are worth a lot more $. Had to give him credit for an interesting excuse.
BTW, I have a dandy old 5X7 Elwood someone can have fairly cheaply if they want to drive to Tonopah Nevada to pick it up. I might haul it as far as Reno. $125 bucks.