Hi al,
I didn't know what the call them but I mean the bits on the back rest that the headrest slide into.
I've looked on the Web and can't see anything that helps.
Can't up load photos but I'm sure you all know what part I mean.
Cheers,
Po79.

Sorted now.

You stick your arm up inside, cut the tools of your fingers badly before realising there is a small hole on the top that you stick a strong thick piece of wire in to release a clip then pull hard and they come off.
Shame about the fingers though.

Po79.

Surely you're left with holes in the fabric covering the backrests?