Here's a thought since I doubt you could find NOS ones at a reasonable price or anyone would be willing to produce new ones. Since you have a few original good ones and can see how the wood grain looks and the color, faux finish them to look like the originals and clear coat them with a 2 part poly paint to seal them up and preserve them. Even if you only come close to looking like the originals if you do the whole car no one will even notice. That's what I would do. But then again I am always taking on these tedious, time consuming resto projects. When you can't get an original part and need it you have to as they say now "Think Out Of The Box". It's easy for me as I have been doing that for 40 + years. "Doc"