That's not a standard Nacra part.
I do think that you need to get some new bridle wires. I've been on the water with less rust on mine and while we were 2 on the wire, and we had cranked the downhaul and outhaul. When puling the main tight the bridle exploded! we limped back to the beach with only 4 of 9 parts of the wire still attached.
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Stefan, Denmark.
H14,H16,P16,P18,SC17,N5.8
Team StaySail
http://www.staysail.eu--