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'68's are more of a "smooth" vinyl as compared to the '69 & up "Comfort Weave" style. They look like the leather ones from mid-'70 and up. They are also flatter & thinner.
They mount on chrome stand-offs on both sides. No swivel, just up and down. The stand-offs are pretty skinny, like 1/8". I would imagine that this design changed in 76 with the death of the Vert...if not before.