72 Rear need to have holes drilled I have a set of on my car and have a set of NOS in the Ford Box with a mounting diagram that shows where to drill the holes, Front are clipped.
600 to 700 to install your stuff at $75(high end of the scale) that's 9 hours for 2 seats, come on an experienced guy should do it at 2 hours a seat max that would be $300 labor.