Adding Headrests

Here is what I have (info) on the Shoulder Belts:

"HAVE XV MOTORSPORTS SHOULDER BELTS, NOT INSTALLED"

I know that's not much, but it is all I know about them.
Here is the ad for the car (I bought and sold it already so don't bug the poor guy!):
http://www.forabodiesonly.com/mopar/showthread.php?t=106228

Later,
Bruce B.