Would not be long enough for a PzIV in most cases. They need to be ordered that way, and i'm not sure that was even possible.  Pz IV rarely used them as it required the removal of the Shurzen . Same witht the Stug's and PzIII's. If they had the side armor it needed to be removed too use the WinterKetten. Then they were replaced with the standard tracks as soon as was practicle as these tracks put very great stress on the drive train of these tanks.