Connecting sleeve for the installation of 57.0125.00 / 55.0593.00 on the Ragazzon rear muffler 50.0786.64 / 50.0786.84 / 50.0787.64 / 50.0787.84 or Connecting sleeve for the installation of 50.0785.80 on the ragazzon centre muffler/pipe 57.0125.00 / 55.0593.00