Here is an example of the shim I had to find. As Matt said, these are pretty specialized screws as well. The shim seat screw is hollow and then carbide cutter screw is solid.Someone school me on this. I thought the shims were softer material to prevent wear on the tool holder? I would think insert screws were standard sizes. I bought a pack for some of the tool holders I have. They were not the same brand but work fine?
This is the screw that holds the cutting insert:
This is the weird hollow screw with internal threading. It holds the shim seat to the tool holder and accepts the screw above that holds the cutting insert:
This is what the actual shim seat looks like: