Just to play devil's advocate, my concern would be as going between the marks, 7 to 7.5, I wouldn't want to be liable if you swapped the interiors and the person who gets your old car with the newer cloths seats has an accident and the side airbags don't go off. After some digging they would work out it's had an interior swap and come knocking. Vice Versa if you had an issue in your newer car with older seats. Food for thought.