I was at Ikea yesterday and bought a unit that came in a long box. Not a problem, just needed to drop the rear seat back, recline the passenger seat and take the headrest off.
Sorry if I'm being a bit thick, but I couldn't get the headrest to come off. I reckon every other can I've owned had the two rods attached to the headrest, so it could be taken off the seat. On my GTD it seems like the metal rods are attached to the seat back and the headrest goes up and down on them. Either way, I couldn't work out how to remove it.
Managed to get the package home okay, but was a pain as I had to take it diagonally through the gap between the front seats.