76 duster window sweeps

Looking for window sweeps/cat whiskers for my 1976 duster. Confused ! A lot of websites show 8 pieces, but I only have 4 on my car. Other websites show 4 pieces but for the outside only ? Has anyone figured this out ?
Mopar Cat Whiskers Side Window Sweeps 1970-1976 Plymouth Duster, 1971-1972 Demon,1973-1976 Dart Sport - Dante’s | Mopar Parts Catalog |Classic Muscle Car Parts