Experienced my first set of mdr-v700dj headphones breaking! I've noticed lots of people posting about the hinges breaking near the swivel. I did some research and here are the replacement parts you need to repair the headphones if you just had the speaker cup holder break that holds the speaker to the swivel.

right hanger, 421814201 -- $15.95 ea.
left hanger, 421814101 -- $15.95 ea.
hanger lid, 421814301 -- $10.31 ea.

you need a hanger lid for each hanger you replace (left or right).

I'd like to see someone re-engineer a set of these hangers made out of metal or at least a more durable material.

Anyway, to order just call Sony at 1-800-488-7669.