Chrome or Orange?

The more modern internal electronics don't require or use the 5th wire. The fact that the harness has the 5th wire doesn't matter. No need to cut or alter anything. In fact there are or were some later boxes displaying a 5th pin just for the end users comfort. That pin wasn't attached to anything inside the box.
I purchased a used chrome box from a member here about 4 years ago. It has worked fine.