dalolen,

I glued a piece of 1/8 square balsa stick to the inside of the headrest with CA. Then sanded the balsa flush with the plastic edge. This gave me a little glueing surface for the fuselage seam. I then glued the headrest on with epoxy and formed a small fillet around the base with the epoxy that squeezed out using my finger dipped in alcohol. Taped it down with masking tape and it worked well.

pmw