Thanks Ben, sounds like I have the original seat with the headrest option. 👍Hi Wayne-
The oem bench seats all had a single headrest support (it was a bar about 2" wide).
Bucket seats had two round "poles" holding up their headrests.
67 & 68 bench seats all came with the mounting points on the upper cushion frames for the optional headrests even though most did not come with them, so it could very well be you have the original seat afterall.
Pics would do wonders for helping to ID it.