Take the cup of the bolt out, take the bolt out.. and use a regular bolt in there, even at ebay u can find something similar that fits in there, those self extracting bolts are still in production by other companies. From what I understand of your description the bolt broke.

Looks like campagnolo victory to me, maybe wrong tho.

"42-14 than say 53-17" <-- this is your choice, I would use 42x16 tho.