What are the companies that make car bumpers in China?

As far as I know, Jiangnan Molding Technology is the largest service provider of automobile exterior parts system in China, and its subsidiaries are all specialized in producing automobile bumpers, including:

Jiangnan Molding Technology Co., Ltd. (Jiangyin), Shanghai Chenming Molding Technology Co., Ltd. (Shanghai), Shenyang Minghua Molding Technology Co., Ltd. (Shenyang), Wuhan Ming Jie Molding Co., Ltd. (Wuhan), Yantai Yueming Molding Co., Ltd. (Yantai) and Beijing BAIC Molding Technology Co., Ltd. (Beijing).

Specific information can be found online.