Head rest screws

[pkort@cis.picker.com]

  Last night, finishing up the installation on my new roll bar ( AutoPower
from CDM, thanks Dennis ) my wife noticed the head rests wobbling.  So I
guess it is time to figure out what type of screw is supposed to hold them
in place.  This is on a 1969 1600, and the screws are the two in the back
of each seat that hold the head rests in place.  Anybody have a guess?  I
never had them so I don't even know what type screw/bolt it is supposed to
be.

Thanks in advance,
Paul
OROC