Jeremy, good point on the lack of brace and holes, can't argue with that evidence and its good it matches the SPID lack of buckets.
Indeed on the green interior on yours. I'm just so used to seeing the fawn on these 67 gmc's, especially the teal/green outside colored ones. Here are a couple of those Eric found:
http://67-72chevytrucks.com/vboard/s...d.php?t=648372
and this 4x4 that had factory buckets.