In order to fit a cooling Fan to your MX450 Radiator you need the fan, the temp sensor and the nut to clip into the mount.
On our web store these parts are available individually so be careful to order the KIT which is here > https://braaapmotorcycles.com/products/mx450-cooling-fan-kit-fan-mount-temp-sensor?variant=40196443766853
We often get asked if you can fit 2 fans, One for each side. While we have seen customers do this we don't have official guidance on this at the moment as we haven't used 2 fans on our personal bikes or the company's demo bikes. We found 1 fan to be enough.