Jonesy,
X2- this was an option to the base model Special wagon. It did not come "standard" with carpet and the steering wheel was much different , it had a round hub in the center.
J3- this also was an option to the base model Special wagon. The trim piece that surrounded the instrument area was a molded hard plastic, no pad.
Q6- there is a foot note that reads "Standard on Bucket Seat Jobs"
So X2 and J3 would not apply to a Skylark or GS because they were "standard" to these models.
As for Q6, It is a "Bucket Seat Job" as part of the GS description. Here is an interesting point, I have a window sticker for a GS that has an additional charge for the bucket seats. I've seen this on others as well.
H2- Again, as John pointed out, it is part of the GS package
As to the ash tray light, it was standard on a Skylark, I'd suggest looking at the dash harness in that area.
Hope that helps to clarify,
Loren