The wood panels could have been built to work without extra screw holes by using the same screws that already hold the cluster cover on - that's what I used to have. If that cover was used with any of factory packages trim, whether burlwood, aluminum, etc., those extra holes would be covered. Plus any cover could be drilled to take the wood panels, which is why I say they can be separated. I already have the dash and door panel inserts, so I don't really need the whole package.
I can't really picture a factory trim package that would use wood inserts so short. It seems like there should be a pull handle in the middle of it.