If I'm not mistaken, the Mamiya AF needed an upgrade to make it work with digital backs.
Kumar
iXpress work whit 645 PRO and 645 AFd, I do not know if a AF work whit a UPGRADE, but for shure a AFd or PRO , BUT it is NOT the same Adaptor, for PRO i different thant for AFd.
Maybe , just maybe, I can sell mine, but it is for AFd....
Next week I have to test the back in a RZ, if that work I sell you the adapter..
Best
Efrain G