By the time the fan of my IC-2820 became really noisy. And as it runs from time to time automatically it can be disturbing although the unit is mounted under my table here. My friend DL5BQ was so kind as to look for a replacement part. And as I did not want to just cut the wire but leave the original part as it is I looked for the connector. The replacement is a Pabst 0412 fan that comes with a 5,25” PC connector. I replaced it with a 1.5mm two pin JST ZH connector.