they clip in. He will need to cut the seat open or remove the backing plate to get them out. I think you can actually buy the tubes from Vauxhall still. You will also need to cut your seats to fit these btw
Finally fitted the headrests. Dead easy in the end.
Just a little ‘how to’ if anyone is interested.
I wasn’t sure about how the tubes fitted so rather than cut a hole in the cloth then find they wouldn’t fit, I decided to go the more experimental route.
First I removed the seat back cover. They are just pop out clips. I noticed that in the metal backplate that there seemed to be pressings where the headrest legs would fit so my idea was to cut a hole in that to see inside.
It looks tatty but I cleaned the hole up with a file and then of course it’s covered with the back cover at the end.
Anyway, upon inspection you can see exactly where the tube fits.
Next step was the scary ‘no going back’ bit of actually cut the seat cloth.
Next, see if the tube fits, which of course it did. Just had to side it in half way, tease the cloth over the wider locating lugs and give it a gentle tap in.
There’s no need to cut a hole in the metal for the rest of the sleeves or for any of you doing this job. All you need to do is locate the places for the tubes by feeling the top of the back rests for the thinner pice if foam. Like this.
Next just cut the cloth in the right place for the rest of the tubes as small as possible and push the tubes in. Remember to face the release buttons for headrest legs toward the front of the car.
Job done. I imagine the job and the rear headrests are the same on all models. Having said that I made sure mine came out of another convertible albeit a different year.
I hope that helps someone.