I just bought a 2001 F150 Supercrew Lariat. It has captains chairs in the front which do not have moving, detatchable headrests. Instead, the seats have molded, more-or-less pyramid shapes to the tops. The problem is that the straps for a prtable DVD player will not stay attached due to the slant of the contour, as there is no headrest gap to use. Has anyone seen this problem or have an idea for a solution? Thanks.