Do not give up on your 968 sport seats!
I read with great interest the various posts about the seats giving drivers a literal pain in the butt. I have had this exact problem, and had my suspicions about the seat being uncomfortable because we are just too wide.
First issue: I am not that wide; actually pretty lanky, and tall, about 6'-4". For my abnormal height, the 968 is perfect, and for my below average waist, the car is too narrow? It did not add up
Second: I do not think that Recaro would design and fabricate a seat that seems to have this kind of flaw; side support is great, but not at the expense of my accelerator leg.
So if I put a folded towel on the seat, with maybe 1/2" of thickness, it completely fixed the problem, except of course that i now slide around on the seat. The other problem is I am now a little too close to the roof liner.
So I took the seat out and detached the seat back from the seat base for a little better handling on the workbench. Note that the seats have a weird center of gravity, and have a tendency to be a little hard to maneuver unless you take the back off-- especially if you have to work on the seat. Looking at the underside of the seat, it was clear that there was a separation in the foam padding, directly below the seam between the seat cushion and side bolster, going from front to back. Because of this tear, it means that your butt sinks just a little farther into the seat, and then direct side pressure from the seat bolster frame.
My solution: I had a piece of medium density foam left over from an Austin Healey resto. It was a little less than 1/2", so i trimmed it down a little more, and inserted it between the springs and the existing foam seating. I would NOT recommend a DYI try and insert it between the leather and the existing foam- the two are connected together in a few areas, and would require you to completely remove the seat upholstry. After having seen so many bad re-upholstry jobs on British sports cars, i thought that not wise.
After a few butt tests, I had the right thickness, which was about 3/8 inch, and i also added a little padding-the kind used in pillows-- to fill out the two side bolster, and the end result is close to what i think the original seat was designed to do--provide lateral support and be comfortable.
One
BIG advantage to removing the seat: you can also attend to those usually hard to reach chores in the footwell like adjusting the clutch pedal, and you can also clean out 16 years of unreachable trash that was collecting under the seat. I took some photos along the way, and will post if anyone is interested in attempting to fix that pain in the butt......