Also, I believe this statement is incorrect; "A newly required
Center High Mounted Stop Lamp (CHMSL) was installed on the Camaro. 1986 was the only year to see this attached to the hatchback glass on base model Sport Coupes, Z28s and IROC-Zs; In following years it was implemented in the rear decklid spoiler, except for 1987 base models that did not have a spoiler."
I thought that the RS's (since they had the smaller spoiler, same one that my '85 z has) had the light inside the glass, at the top. I know that is how my '91 RS is.