Firstly, seat belts! Have the seats been removed from the 90-92 GT or the 92-95? If they're from the later model then your quite lucky as the seat belt clips are bolted on to the actual seat, and all you have to do is put your seat belt clip on to the GT seat, Whereas on the earlier model the seat belt clip is onto the body of the car and you'd have to drill holes on to the body of your car to hold the new seat belt clip, as far as i can remember as we had to do that when fitting the GT seats on my dads old Sportif. As for the rears, its a straight swap. Pull the bung clip things off the back of the seat which hold the boot carpet on, undo the bolts, bolt in the new and clip on the carpet! Good luck!