Replacement refrigerator fan?

[ShrimpBurrito]

Has anyone found a direct replacement for the fridge fan? I haven't taken it out yet, but I think it's just a PC fan. However, all the PC fans I've ever seen have mounting flanges on both sides. That won't work because then the round hose won't slip over the fan shroud.

I could just get a 4 inch fan (92mm might be the closest, about 3.6"), and then Dremel off the flange on one side, but if there's an off-the-shelf solution, I'd rather do that.

Most PC fans are also 4-wire, so I also just need to figure out which 2 are for power.

Thanks!
Dave