Well that sucks buttermilk up a dogs butt. Looks like they don’t offer a 170 degree thermostat anymore. And the price went up. Damn. That blows. Hope mine never takes a dump.
You need the 304 (160) 305 (180) or the 306 (195). Unless you have a magnum. Them any of the 2.125 diameter thermostats will work, IIRC.