Bucket seat tracks

To clarify - The seat track are the same 67-9 darts, but my seat covers and foam for my 69 dart will not fit a 67 seat frame?
Correct. The 68/69 seats have a few differences that the 67’s don’t have. The buns are thicker, they have a Masonite like back cover that is covered in the vinyl seat material, unlike the 67 seats which have a metal back cover with stainless trim, and lower metal seat trim with a stainless trim, which the seat adjuster lever comes through. The 69/69 seats also have black handles on the seat adjuster levers, 67’s are chrome, and the seat backs of the 68/69 seats lock in place, whereas the 67 seats don’t have a lock and tip forward without latching.