Corbeau LE Seats

I have posted before and had a number of good suggestions about making the driver’s seat more comfortable for an old git with a 34" inside leg measurement.
I have tried several options but I’m still having difficulty with my lower back.
Has anyone fitted the Corbeau LE into a stock car that hasn’t had any trim removed and if so did they get significantly more leg room. If it did work I can probably pad out the basic seat to fit my lower back.
In a bit of trouble as before lock down we did three 3,000 mile 3 week continental driving hols but now I’m in significant discomfort after less than an hour.