Then the customer signs a waiver saying they understand that non oem parts were used.
We only accept that on body sheet metal, and in cases where oem parts are no longer available due to age, ect.
One court case can wipe out twenty years of honest business practices, and juries love to hand over millions.
And the dealer's liability insurance? They pay their full face value to the injured party, wipe their hands, and say, "son you're on your own".