I use to do this... unfortunately, I can't for the life of me remember where I sourced the fans from.
It was from an online electronics supply warehouse. There are hundreds if not thousands of fans available - just take the dimensions for the one you're replacing and start doing a search.
I wish I could help you more with this at this time, but I recall the search taking me at least a solid night of searching deeper and deeper until I'd found the exact fan i wanted.
Most fans from suppliers will also provide a dB rating as well as an airflow rating. Obviously, lowest dB and highest airflow are good things.
There are also two voltage types... 5v or 12v.
Run your TLP to get a voltage reading to find out what the output is. I don't remember what it is, but I *think* it was 12v.
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