I haven't had Allstate for car insurance in years, but Geico, and I assume all others, will use aftermarket parts such as panels and bumper covers, lights, etc., if the car is over X number of years. I was unfortunate to have to find that out when another Geico customer hit my car while it was parked in a supermarket parking lot. Imagine, you're not at fault, your car loses value from an accident, your car loses more value because aftermarket parts were used to fix it, and the insurance company makes money!!! Car insurance is a profit-driven, government-mandated, evil that does not look out for their client's interest. I have since opted to buy Liability coverage and take care of any fixes myself, selecting the parts and shops that are used in the process.
Good luck