I don't know if the radiator in the cooler is a HP proprietary component. If it is a standard size, you can contact one of the cooler manufacturer's Tech Support to see if they have a fan that is compatible. It sounds like the connector is a standard 4-pin PWM.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".