Dave,
I replaced my refrigerator fan back in 2015. It was available through Amazon. Unfortunately that particular item now goes to a dead end. I did find something that should work. My replacement is square and measures 92mm. This particular fan has 3 wires but I think all you might need is the black and red wires. You will know which to use when you remove the existing fan.
https://www.amazon.com/Genuine-Dell-...ts_id=11036281
Dick