Ahhhhh relief!!!!! I put some back supports I had from years ago behind the sheepskin seatcovers and WOW what a difference. After driving for 3.5 hours in the dark I arrived feeling very limber- I felt very comfy in those torture seats!
I am trying to find the company that made my back supports (they are very old) but here are some I found on the 'net... the only real difference I can see so far is that mine have an elastic strap to hold them in place.
(Some I found on the 'net)