Amazon.com : 2 Sets 135 35mm to 120 35mm Cassette Accessories 135 Film Cartridge Adapter Canister Converter Panorama Like Xpan Camera for Pentax, Rolleiflex Mamiya Hasselblad Makina Bronica Medium Format Camera : Electronics
Mamiya 7 35mm Review (No 35mm adapter required!)
Same format, different story: Making the switch from a Pentax 67 to a Mamiya 7ii - EMULSIVE
Used Mamiya Panoramic Adapter Set for Mamiya 7 in 'Mint-' condition