Canaan Avalon Cooler Master fans

I have a few Avalon 1246’s. Once an exhaust fan began faulting out, I swapped it out for one of the intake fans with the logic that the front fan position isn’t being blasted with heat. It worked. This happened again on another, same trick worked. I need some replacement fans with the square 4 pin connector. Where do I find these?
I tried a generic fan from eBay, lasted 3 days, couldn’t take the heat on the exhaust side. It says Cooler Master on the OEM fans, I didn’t see it on their sight either.
Thanks in advance

Update. I found some fans from BT Miners, looks like they have an adapter that allows it to run on various brands. Not the Cooler Master brand though.
The look generic.

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