I have a 1993 s-10 blazer, 4x4, 2 door, 4.3 liter. My problem is that both of my front seats, the top part of the seat swing back and forth freely. I was wondering if there is any way you can fix it or if I have to buy new devices on the side of the seats, if so were.

Go to a dealer parts dept and have them show you the micro fish look at the parts you need and price them. If it is more than you want to pay go to a scrap yard and ask for a price.
Are you talking about the head rest or something else.