Are you sure you really want the metal hoods made by Mamiya?
I found the darn things way too clunky, too expensive, and the jam screw mucks-up the lens barrels.
I'm far happier using a step-up ring or two, and using a three-way collapsible hood or a rigid round hood. Using the three-way, I cover the 55, 65, 80, and 105. Another rigid (rubber) set-up and i've got all the longer lenses covered.