Freshening up a 1990 LX Mustang, non-GT. Re-doing the interior with standard seats and will replace the foam cushions as well as the upholstery. I am reviewing TMI's catalog and see that the GT had seats without the knee bolster which has extra height on the sides of the seats for increased cushioning or support. Since I am replacing he cushions on the standard seat, can I order the GT style cushions and upholstery without the knee bolster and have the GT style with the extra side cushioning and upholstery fit on the standard seat frame? I'm hoping the basic frame is the same , but want to check with anyone who may know or has done the conversion. I am comparing the low back standard with head rest and the low back GT with head rest, not looking at going from low back to high back which probably wouldn't work at all. Thanks Dudley