Question about the '68 CST model(s)

[OregonNed]

I'm not sure if this question can be answered or not. I'm attempting to see if my truck might be a CST model. By the time I purchased it, it appears one door had been replaced (different wing window trim - black and a diff regulator, instead of chrome on the other door) - no door CST emblems. The truck had been completely repainted - SPID absent, later year Blazer bucket seats installed. The only clues are the original chrome bumper on front, trim on hood front edge, as well as the trim (eyebrows) down the sides of the front fenders by the headlights. Original side trim all removed and holes welded up. No sign that there was any trim on the tailgate or tail lights. I'm guessing any of these options might have been available on it regardless of CST trim, but who knows? Thanks for any input. Ned