If you are looking for alternative thermistor that will work with the Mosquito Hotend check out the following options
This is simply the highest performing thermistor on the market. Custom engineered to Slice’s specifications it is able to accurately read temperatures from room temperature all the way to 500 C, eliminating the need for high temperature RTD's or having two separate thermistors to maintain accuracy at both the low and high end of the temperature spectrum. Overall length: 22 mm. Diameter: 3mm. Molex connectors.
Designed, engineered and manufactured in Japan, assembled in Hong Kong.