I asked Mick if he could miss out the large cut-outs for seatbelts. I drew a small taper to the rear to make room for them.
For comfort I also went for the longer S3 type but don't think it makes any difference.
The foam is also a bit squashy and flattens after a few hours driving, I would try memory foam if made again.
On mine the rear goes down to the cockpit floor with the squab in front.