Automakers actually manufacture only a few of the parts that go into their cars. More often than not, specialized manufacturers will design and produce parts that end up being used by the automaker. These companies are known as OE Suppliers, and if you see a part listed that way it means that the part you are ordering was made by the original company that supplied the part when it was new. It is perfectly acceptable to use reproduction parts, but nothing compares to the original equipment part when it comes to bringing your vehicle back to perfect form and functionality. Some of the largest OE suppliers include companies like VDO/Seimens, Continental, and Victor Reinz.
Automatic door locks couldn't work without the proper solenoid and actuator, so make sure that you get yours replaced if you find your locks stuck in the open or closed position.