These older boxes are 50' or so in length, boxes are customarily much larger, now. The Snap On dealer really didn't want to take the lower box into his inventory, due to its age and size. The old one was a MAC 1700B, like the one pictured below. A local mechanic was purchasing a new bottom box, and trading in his old one.

So a few years ago I was presented with an opportunity to purchase a vintage MAC tool box.