I  fixed mine on an 84 with regular epoxy.  Mix up some with some type of
thickening agent...sawdust, talc, heck..even dirt...and stick the pieces
together or put a dab on where the screws are supposed to grab hold.  Put
something on the screws to act as a release agent, something like vasoline
or paste wax...push the map pocket into place and wedge it there till the
epoxy dries.  Good to go.
  I use West System Epoxy for plenty of repairs around my van and for
weatherproof finishing and adhesive.  Good stuff, available online or at
boat supply stores.
  Don Hanson