I notice that the MSA foam seat core (item code 40-2691) is identical for Z years 70 to 78. When I check leather seat cover stuff from MSA it says that there are 3 different sets of leather seat covers (code 40-2700 for years 70-73, 40-2701 for years 74-76 and 40-2702 for years 77-78) that are not interchangeable. If you get new foam seat cores that are the same for all years from 70 to 78 what is different in these 3 leather seat cover codes that doesn’t allow them to be the same across the 70 to 78 seat years? It doesn’t make sense that the foam cores under the seat covers is the same, but the leather seat cover over those foam cores is different depending on the year of the car seat. I understand that the series 1 (1970 – early 1971) cars have material strapping vs spring steel for support in the seat bottoms, but that doesn’t seem to make a difference for the 40-2700 seat covers which MSA says runs from 1970 to 1973 Z cars.
Just color me very confused!