I have two bits of it left to sell I no longer use.

FIrst is a Hassy lens to Mamiya 645 adapter. This one is well made and hit infinity with the Hassy 110FER lens I used it with. In padded case, EX+++. Asking $125

Second is a Mamiya brand 2X "N" 645 version teleconverter for manual focus Mamiya 645 lenses. This converter is excellent optically, but I no longer own any mamiya manual lenses. Includes caps, but no box, EX+++. Asking $125