I hope this might help someone if they plan to do this swap. I just did a full Rekluse RadiusCX 4.0 autoclutch and basket on a '21 Rieju MR300. I was very impressed with the quality of all the components included and wouldn't hesitate to recommend the setup. Only issue was the lower bolt access on the clutch cover was a little too tight for a socket. Still managed to get it torqued down, though. Things needed to complete the swap are your choice of gearbox oil, a new clutch cover gasket, mineral oil for bleeding the clutch, and the required tools. I'm happy to answer questions if you have any.
Rieju MR300 - Full Rekluse Setup (RadiusCX 4.0 and Basket) Install - Part 1 -
https://youtu.be/IgMPHPGAsjQ?si=lIaKXCeGVj7u2Ne-
Rieju MR300 - Rekluse Install - Part 2 -
https://youtu.be/F8ppiv7VttA?si=kK2iw41kra1_vAea