Philip the Y on the trim tag is Bucket seats with headrests.
Here's how the trim tag decodes....
03D = March 67 4th week
67-12667 = Camaro convertible with custom interior
765-Y = Black custom bucket / Bucket seats with headrests
XDL =power windows, power top, fold down seat
2EMG = air conditioning, automatic transmission, console
3L = rally sport
4F = remote mirror
5B = bumper guards