Yes, the CHA for the decals means you had the charcoal (silver) decals on the car originally. From looking at your build sheet, you have (in box #79) 19 and 19 for paint coeds, so the car was the starlight black exterior with the Silver Decals (Nice combination by the way). The interior code (in box #77) shows 19B which is the black cloth deluxe interior. It also looks like your car came with Fisher T-tops (CC1 in box #78), power windows, A/C, Power trunk, Cruise Control, AM/FM Cassette with Power ant., Tilt wheel, .... pretty much a loaded Trans Am. Do you have any other questions about the build sheet?