Obviously had to cut the wire to original switch and used a flat blade 5mm female brass crimp connector (and a bit of heatshrink sleeve).


http://www.tridon.com.au/products/Tridon/35/483/switches-and-sensors/2014/thermo-fan-switches/1117/TFS139
Also replaced thermostat with high-flow and lower opening temp Tridon TT2001-160
http://www.tridon.com.au/products/Tridon/35/479/thermostats-and-gaskets/381955/thermostat/101180/TT2001-160