The 767 is the only aircraft that currently uses the LD2 container due to it's narrower fuselage compared to other widebodies. The LD2 in fact was designed just for the 767 since all other widebodies use the LD3. You can however load LD2 containers on a an airplane that normally takes LD3's. You just load the containers so that contoured end (the bottom corner that is cut out for the bottom curve of the fuselage) faces the inside of the bin instead of the outside. Here are some links with pictures and dimensions of different ULD types. I think you will be surprised by how many there are.
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