It may be old, but it hasn't changed at all as far as I know. I'm not sure what you mean by just the control unit. The electronics kit contains a dozen different parts needed for the installation (cables, brackets, screws, tape, wiring harness, etc) not to mention the DVD player itself and the trim that goes along with it. Like I said, at the very least you'd have to buy that entire kit and then figure out what you are missing from the headrest kit and, providing they have individual part numbers, buy those missing parts if they will sell them separately ... which is no guarantee. I once wanted to buy a switch that was only present in a $1000+ kit and they couldn't sell it to me.