Driving your C5 comfortably is important; if your seats aren't adjusting properly, it may be time to replace your old, worn out lumbar bladders. These direct replacement for late 1998-2004 Sport Seat Lumbar Bladders are an affordable fix to maintain comfort in your Corvette. These replacement bladders feature improved vacuum nipples that increase the longevity of use as this is a common main failure point on the originals.