Original sentence: 1S91 - PT-76 converted into the guidance vehicle of 2K12 Kub surface-to-air missile system.2P25 - PT-76 converted into the launch vehicle of 2K12 Kub surface-to-air missile system
Edited sentence: GM-568 - PT-76 converted into the 1S91 guidance vehicle of 2K12 Kub surface-to-air missile system.GM-578 - Chassis used for the 2P25 launch vehicle 2K12 Kub surface-to-air missile system.It uses some elements from the PT-76 including the drive train and wheels