I find the same issue with the D2 Michelle, I don't quite feel comfortable as my right shoulder is wedged against the pillar.
I reckon the Rangie classic has more 'shoulder' room than the D2, enough to notice anyway (this is from memory only). I've not sat in a P38 so I can't comment.
I'd recommend your old man at least has a sit in a few vehicles to check the width. He'll know just by taking a seat in it that something is either suitable or unsuitable. Perhaps as suggested earlier, a GQ patrol, or even an 80 series cruiser.
