Help with LMC Headliner w/built-in speakers

[78 Big10 454]

I had a Hi-Liner in my truck for years. Swapped it with the factory headliner that had lost its adhesion. It was a snap to put in and the speakers supplied with it were more than adequate. I added additional after-market lights to brighten up the cab. After badgering me to no end, I sold it to my cousin who had a '77. I installed a CB radio where the am/fm unit was intended.