As I recall, the Mamiya lugs are slightly larger than Hasselblad/Bronica lugs. This strap and clips should work on Mamiya 645, Mamiya RZ & RB bodies, and the Mamiya C330 & C220. I don't need a strap and I'm unaffiliated with daleeman. Please correct me if I'm wrong.
yup, the RZ and 645 lugs are interchangeable. the posts on the RZ body are square though so the lugs stay in the orientation you put them in.