Believe it or not, but only a fraction of the parts that make up your car were manufactured by the automaker. 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 they are the ones who originally manufactured and supplied the part to be assembled along with the rest of the vehicle. Reproduction parts are good, but nothing compares to the original equipment part when it comes to restoring your car to showroom condition. Some of the largest OE suppliers include companies like VDO/Seimens, Continental, and Victor Reinz.
Your car's air conditioning isn't the same without a working receiver drier, so make sure it is changed whenever any work is done on your HVAC system.