The Stovebolt Site Forums The Shop Area Driveline Bell Housing Mounting Pads

http://www.classicparts.com/1954-72-Rear-Motor-Mounts/productinfo/79-111/#.VDAq_eevfbA

Does that show the part/parts you are looking for?

They usually come as a set, but I have seen the parts sold separately at a parts store (like NAPA), but you need the part numbers. I'll look - I have old parts in boxes somewhere in my garage.