Okay, so standard T6 head rest in third row centre.
Golf MK6 centre head rest in position.
No headrest just to cover all comparisons.
So the golf one I got on eBay is not too bad a color match for the T6 ones. Needs a little cleaning, but otherwise in great condition.
There's no swivel adjustment in it at all and the underside curve it isn't deep enough to sit flush on the T6 seat, so it sits a little proud. Would have been nice for it to sit flush, but hey, it was only £20 to see the fitment in person.
Legs aren't long enough at all to sit much higher than in the above image, but that's not why I looked at it as a.replacement. Will I keep it in place? Who know. I'll clean it and drive with it for a week or two and see how I feel towards it staying in situ.
Hope this is of help to others thinking about this.