Connecting sleeve for the installation of 50.0733.80 / 50.0734.80 / 50.0825.80 / 50.0826.80 on the ragazzon centre muffler/pipe 57.0118.00 / 55.0569.00 or Connecting sleeve for the installation of 57.0118.00 / 55.0569.00 on the Ragazzon rear muffler 50.0735.64 / 50.0735.74 / 50.0736.64 / 50.0736.74