These are the fans I used.
https://www.amazon.com/dp/B07NMC9X38...detail_0?psc=1
I found installing them on the bottom vent blowing upward to help
ours more than blowing out from the top. I used a thermo snap disc fan switch that kicks on at 90 degrees. The existing fans don't kick on until 130 degrees. I've not heard our factory fans kick on since installing these.
Huge improvement in performance.