68 Dart seats

hey guys I am looking for a set of bucket seats for my 68 dart. I am having a hard time locating 67- 68 seats. but there are alot of 71 and up seats. I want to go as close to stock as I can. It looks like the 71 and up seats are the high backs, did they offer the high back in 68? Is there any of you guys running high back buckets in 67-69 darts? thanks for the help.