Add headrests to 67 Dart bucket Seats

Sorry, but I don't know what "have the provision for the headrests" means.
Is there a frame or something in the seat back I should look for? I'm going to
take the buckes apart before I take them over the the upholster guy to save
a few dollars. I'm "assuming" there should be some sort of frame of something
the headrest tubes could bolt too???

Yes, not all buckets seat backs have the holes in the top of the seat backs for the hardware. You will know right off if your seats do when you take the old covers off.