Assume you mean the white plastic flat 6 pin rectangular connector? Has it got a hooked tab on the other side?
Nearest I can suggest is a 6 Pin miniature nylon MOLEX-Type connector
www.jaycar.com.au/6-pin-miniature-nylon-molex-type-connector/p/PP2025. The metal contacts come separate to the plastic housing. It is OK for signal transmission.
Why wouldn't you buy both ends of a three pin connector and replace the one you've got, since it looks like it is only connecting 3 wires? Or are you looking to add additional contacts in the existing plug/housing? If so, and the Molex isn't the go, there're several types of automotive connectors where the contacts come separate to the housing. You may be able to find one that you can use the contacts from for your housing/connection.