Not sure perhaps this would help?
Changed back box panel on The Addams Family a few years ago so both speaker openings are large and use 5.25" Pinball Pro speakers. This plus Pinsound with stereo wire harness makes it closer to stereo. Did not take pictures at the time but just did same to Dirty Harry last weekend. Did not use Pinsound for DH but did take pictures. Maybe to many pictures was a several beverage job. Hopefully link to post in DH Club thread follows.
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