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Mamiya Press Roll film holder on RB67 Pro-S

theo120mm

Hello,
Recently purchased 2 120/220 Roll Film backs model 2 from a Mamiya Press.
They have the P adapter and the M adapter, as I haven't received them yet I would like to ask if I need anything else to put them on my RB,
or I just remove the revolving adapter and they fit straight on ?
Also I have heard that they handle film flatness better than the RB backs is that true?
Anyone has any experience using this back? Any tips?
Thanks in advance.
Theo