Just another opinion. I believe they are metal because of the small dimensions of the struts and the 3 rivets suggest there is a reinforcement on the inside of the strut end, so the inside would be hollow for the reinforcement. The chipped paint reveals primer under the top coat. The one bolt that attaches the strut to the wing would simply pull apart if stressed if the strut was wood.
It could be that over the production period, the struts were changed from metal to wood at some point, but this is pure speculation.
The landing gear are definitely wood, or possibly wood covered metal. I believe this was common to get an aerodynamic shape with the use of cheaper round cross section metal tubing.
Anyway, it's another opinion.