Spare Part(Hotend Assembly): https://store.dremc.com.au/products/original-creality-hotend-kit-for-ender-3-v3-se
Nozzles: https://store.dremc.com.au/collections/ender-3-v3-se-nozzle
You will also need to perform PID auto tune on the hotend, and precaution we recommend hot tighten the nozzle at <1.5nm. [Documentation: https://support.dremc.com.au/en/support/solutions/articles/51000266870-pid-calibration]
Install Hotend Video:
How To how change and clean the nozzle:
How to teardown hotend: