This is so cool. I was on the very same project in August 2020. Same speakers, same crossover solution.
Mine were free. A guy posted on the Nextdoor site that he was putting them out on the curb for heavy trash if nobody claimed them, and I did, fast. He even included the surround repair kit that he had never used. What a guy.
These have the vinyl veneer, and they were a bit beat up. The grilles were hopeless, so I replaced them with something not at all original looking, but I like them. I had never done a surround repair, so it took some time to get up the nerve to start, but it worked, although I was pretty messy with the glue.
The sound is awesome, and I look forward to the livestreams of our Houston Symphony this season.
Yours look really good.