Welcome aboard! The Comanche has 4 speaker locations. The 2 front speakers are in the door and are 5.25” speakers. The other two are 4x6 and are in the b pillar corner behind the rear seat near the floor. Many here like to keep everything stock or at least keep the stock locations with updated features. @Minuit is our resident radio guru and sells factory radios that have been completely refurbished and upgraded with really nice modern features. It’s the best of both worlds. Personally, I didn’t keep the stock head unit or even the location though I do appreciate a factory appearance. I retrofit a double din Sony car play unit with backup cam into my dash. It requires a lot of plastic work so if your not comfortable with plastic cutting and welding tools I wouldn’t recommend it.
Then of course there are countless custom options and systems that have been built.