FWIW I have 2016 (same as 2017) taillights and GT trunk panel in Arizona. All are like new if you don't find locally.
But the trunk panel is still on my GT while I try to source a used 2018+ Pony Package panel (colored tri-bar). If you know a source for one (even broken or scratched to hell as I just want the emblem to put on a new FP panel) or if you want just the lights, let me know.
You may know shipping for a panel will be surprisingly high due to length surcharges. UPS, FedEx, USPS all wanted almost $80 to ship a 4lb grill due to the length.