Boss2k: Sorry, I’m not 100% sure how this went, but I remember in 2017 the “base” screen size was 7” and the optional with either Bose and/or Navi screen was 8” for the Gen 6. Navi option was reasonable at $495 (compared to like $2,000+ for Merc and BMW). Maybe the bigger screen is with the price even if you will just be using it to display Apple CarPlay or Android Auto.
https://www.camaro6.com/forums/showthread.php?t=543692
https://www.camaro6.com/forums/showthread.php?t=525133
Edit: OK, seems only base trim levels 1LS/1LT got the 7” screen.