Raymarine ST2000

have you tried Raymarine?
http://www.raymarine.co.uk/view/?id=837

Or contacted any nearby agent?

If you can't get an original you can use any 2 pin plug and socket or 4 pin if you need nmea input. Just cut off the existing one fit a new socket and a new plug to the auto pilot cable. probably cheaper than getting the specific part
 
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