长源东谷：公司目前主要客户包括福田康明斯、东风康明斯等大型发动机整机和大型整车生产厂商

Core Viewpoint - Changyuan Donggu's main business focuses on the research, production, and sales of core engine components, including diesel, gasoline, and natural gas engine cylinder blocks, cylinder heads, and connecting rods [1] Group 1: Business Overview - The company primarily serves large engine and vehicle manufacturers, including Foton Cummins, Dongfeng Cummins, Xi'an Cummins, Chongqing Cummins, Dongfeng Commercial Vehicle, Guangxi Yuchai, Shanghai Diesel, SANY Heavy Industry, BYD, and Seres [1] - There is no reliance on a single customer, mitigating customer dependency risks [1] Group 2: Clientele - The company has a diverse customer base, which includes several major players in the engine and vehicle manufacturing industry [1] - Detailed data on the top five customers can be found in the company's periodic reports [1]