That speaker set and pole look great Pat, awesome job!!
On finding them. Ebay is good as well as swap meets and yard sale's. I found mine another way.
We have (2) Drive-in Theaters within 30 minutes of the house. The one north of me still uses field speakers and has the low power FM transmitter for tuning in via car radio. The other one south of me just uses FM. We were at a Saturday night double feature and took a journey over to the snack bar. I asked the manager if they had any of the old speakers left. He directed me to the owner who was busy manning the ticket booth. When I mentioned the conversation that I had with his concession stand manager he replied that he thought he might have some laying around and that if I came back the next night he would take a look for me.
Welp, I showed up the next night and he led me into the storeroom behind the concession stand. He produced two Projected Sound speakers that were in great shape. I asked what he wanted for them and he replied, "Does $10 sound ok?" I jumped on it!! He then asked if I liked "old tube type stuff". I said that I did and he produced the original 50's vintage, field speaker amplifier! I ended up walking out of there with the amp and the two speakers for $30!
Bottom line, if you have an active drive-in near you, just ask, what's the worst they can say?