The post on the fan that fits onto the motor should be straight; it leans to one side, which means its not gonna spin right and could possibly break while running besides looking stupid since one dome would be normal and this one would not sit level in the engine.

Polar Lights, the kit maker. They will replace parts for free if you have the reciept, otherwise you basically have to buy them. I bought it on Amazon and if the seller put a reciept in the box, I don't remember and the box is long gone anyhow.

The 3d printed parts look better, would be perfectly straight and sit properly in the engines, but I can't buy em as a set, so I'd be spending up to 40 bucks for two, depending on what I had them print them from.

Meanwhile replacements from the Polar Lights would be 6 bucks.