Bob, the head restraints changed from the big blocks as above, soon after 05, probably 06. Is it because you have your seat well reclined?
You could commission some larger contoured bolsters. I don't think bending the shafts will make much difference.
The location of the pics is the Wylye Valley nr Salisbury. We stopped off on the way back from Canterbury, which is why the Roadster looks a bit grubby. We've stayed at this Farmhouse B&B since 1986.................