I hear ya. I didn’t find a lot of info out there, so I ended up creating my own design. Fortunately, it was pretty simple, but may not work well in every case. The head unit will swap out easily with most single DIN car stereo units. It’s been a couple years, so I can’t recall, but I think I found the bus’ radio wiring schematics, cut and labeled them, then connected them accordingly with the new unit’s wiring harness them taped off any unused wires. I bought a fairly cheap Pioneer with Bluetooth and “50W/ch” that would have enough power to get decent sound and it dropped right in. I think that I used the existing mounting brackets. I decided that it was best to not use use the existing speaker locations in the ceiling and ended up mounting 4 6x9 speakers in boxes to the metal panels above the seats with small L brackets. The panels remove fairly easily to run the new speaker wire, otherwise you could go on the outside. Remember to use rubber grommets if running wire through any sheet metal. I then added a sub amp using RCA outs in the head unit and placed it behind the driver seat. There is easy access to the battery compartment and easy grounding to basically any metal nearby. I then placed 2 10” subs over the rear wheel wells where we removed seats and ran speaker wire along the floor in flexible conduit. The whole thing was actually pretty simple to do, but took a lot of drilling through metal. Let me know if I can help any more!
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