Williams Ball Lift Guides Part #1B-2573:
I don't know much about 3D Printers but I would think that this part could be made using this technology and could be made a little thicker using Nylon/Plastic and more durable?
The originals are super thin sheet metal and prone to tearing compared to a Gottlieb version. It would not matter if the reproduction ones were not metal as you really don't see them unless you are working inside the Cabinet. I would think that there are a lot of early Williams machines that could use a new one and I would think it would be cost effective to make them?
These are not stamped Williams so there would be no need to ask for permission to make these which is a big bonus these days. I would think Nylon/Plastic would last forever as well?