170 Thermostat?

I use a 170 in mine switched from the 160 early morning runs or at night it wouldn’t go over 165 so I made the switch . They do make them here in oz but a a hair smaller circumference and needed to put a small amount of foil around the edge to seat it properly but it works well . It’s a Trident high flow. The reason i run this is so I could control the temp with the thermo fan, as I have my fan kicking in at 185 shuts off 180 and On open roads it don’t even kick on have found the car runs really well in that 170-180 range . Before changing the radiator out for a custom one It used to run in that 190-210 range and the car ran sluggish .