Not the part were you put your bottom onto, but the part where your back goes. I hve removed the 4 nylon nuts but I cannot seem to remove the seat. I have removed the 2 headrests and am making sure the seat belts are not in the way. I move the seat outward and try to push up but the seat isn't coming out. I've tried this with a helper also to no avail. I know I've removed it before when I installed by car stero stuff but it seems stuck now, i've tried for over 15 minutes removing this.