According to my 68's body tag, car was built 4th week of October, would that be Oct of 1967? So then round mirrors if that were the case?
That would be correct. Just remember if you add the Right Hand side, since they did not make one specific for it, you will need to be setting in the driver seat and have some one mark the mirror were you can see out it. The left and Right position on door will probably not match exactly.