Would you ever buy a critical part for your vehicle from a third-party vendor, like eBay? Probably not because of the safety risk. But by agreeing to use aftermarket parts that are non original manufacturer parts that is what you are doing. When buying non-OEM parts, you are taking a shot in the dark when it comes to safety.
Buying cosmetic after-market parts that are cheaper may not be a big deal. But purchasing structural parts not made by the original maker of your car can come with risk. Although rare, there are even reports of after-market parts leading to fatalities. This was the case with two teens who died in a 2015 collision. The teens were killed when a jeep with an aftermarket bumper collided with their vehicle. The non-OEM bumper was too large for the frame of the jeep. During the crash, the bumper came through the trunk, pinning the teens in the back seat. It’s possible that these two deaths could have been avoided if correct parts had been used.