1969 Dodge Dart GTS

Picked up some seats from a 68 Barracuda. They are way better shape then mine. I already have new foams and correct patterned 69 dart GTS seat vinyl. I am just going to recover these even though they are in great shape.

Question can I leave them without headrests or would that be incorrect. I have headrests from my other seats can I put them on these seats?