Bucket seat tracks

One of the quirks of the 67-69 Dart Convertible is how many parts are identical to a 67-69 Barracuda Convertible — more so than the coupes. Oddly, although the Dart has a 3-inch longer wheelbase, and the extra length is in the rear seat area, nevertheless the top frame, top, side glass, quarter glass, rear interior panels, rear seat top and bottom frames are all interchangeable with the Barracuda.

1967 A-body bucket seats have a hard shell on the back, which is why the seat parts aren't interchangeable with later years. But I can't see why the tracks would be different. You can certainly swap an entire seat assembly between the years.